user2495: I wonder if the difference has something to do with the permanent destruction (through vipassana bhavana) vs. the temporary destruction (through samatha bhavana) of the kilesas? 

user8157: 
I wonder if the difference has something to do with the permanent destruction (through vipassana bhavana) vs. the temporary destruction (through samatha bhavana) of the kilesas?

Having only performed a very brief search of the suttas, I follow my intuition and disagree with the question above. 
It appears the terms 'cetovimuttiṃ' & 'paññāvimutti' are both used as constituents of the same attainment; therefore 'cetovimuttiṃ' does not appear to refer to 'samatha' or 'samadhi'. 
A search for 'paññāvimutti' obtains 171 results. Of these, many of the results contain the words "cetovimuttiṃ paññāvimutti" together, particularly in the following phrase:

āsavānaṃ khayā anāsavaṃ cetovimuttiṃ paññāvimuttiṃ diṭṭheva dhamme
  sayaṃ abhiññā sacchikatvā
realize the undefiled freedom of heart and freedom by wisdom in this
  very life

About 'paññāvimutti', SN 22.58 says:  

A bhikkhu liberated by wisdom, liberated by nonclinging through
  revulsion [towards the five agggregates]... through... fading away and cessation, is
  called one liberated by wisdom.

About 'cetovimuttiṃ', MN 29 says: 

Yā ca kho ayaṃ, bhikkhave, akuppā cetovimutti — etadatthamidaṃ,
  bhikkhave, brahmacariyaṃ, etaṃ sāraṃ etaṃ pariyosānan
the goal, heartwood and final end of the spiritual life is the
  unshakable freedom of heart.

Now the terms 'cetovimuttiṃ' & 'paññāvimutti' are a type of word compound where the translation is uncertain. Thus, translators such as Ireland & Thanissaro have translated 'cetovimuttiṃ' & 'paññāvimutti' literally as "mind-release" & "wisdom-release". Where as translators such as Bhikkhus Bodhi & Sujato have translated the terms interpretatively as "liberation of mind" and "liberation by wisdom". 
Given the descriptions found in SN 22.58 and MN 29 quoted above, I personally would agree with the translations of Bhikkhus Bodhi & Sujato.
In other words, 'paññāvimutti' sounds like a 'means/method' and 'cetovimuttiṃ' sounds like a 'goal/end'. The meditator uses 'paññāvimutti' to achieve 'cetovimuttiṃ'. 

user2282: 
I wonder if the difference has something to do with the permanent destruction (through vipassana bhavana) vs. the temporary destruction (through samatha bhavana) of the kilesas?

Per the Pali dictionary, CetoVimutti and PannaVimutti carry different meanings depending on context (restricted sense versus highest sense). In the highest sense, both are on the same level for they both signify the fruition of Arahantship. They're just different in regards to the specific pathway as a result of the practitioner's dominant faculty on either concentration or insight.

2495: <p>I wonder if the difference has something to do with the permanent destruction (through vipassana bhavana) vs. the temporary destruction (through samatha bhavana) of the kilesas? </p>
 8157: <blockquote>
  <p><strong>I wonder if the difference has something to do with the permanent destruction (through vipassana bhavana) vs. the temporary destruction (through samatha bhavana) of the kilesas?</strong></p>
</blockquote>

<p>Having only performed a very brief search of the suttas, I follow my intuition and disagree with the question above. </p>

<p>It appears the terms 'cetovimuttiṃ' &amp; 'paññāvimutti' are both used as constituents of the same attainment; therefore 'cetovimuttiṃ' does not appear to refer to 'samatha' or 'samadhi'. </p>

<p>A <a href="https://suttacentral.net/search?query=pannavimutti" rel="nofollow noreferrer">search</a> for 'paññāvimutti' obtains 171 results. Of these, many of the results contain the words "cetovimuttiṃ paññāvimutti" together, particularly in the following phrase:</p>

<blockquote>
  <p>āsavānaṃ khayā anāsavaṃ cetovimuttiṃ paññāvimuttiṃ diṭṭheva dhamme
  sayaṃ abhiññā sacchikatvā</p>
  
  <p>realize the undefiled freedom of heart and freedom by wisdom in this
  very life</p>
</blockquote>

<p>About 'paññāvimutti', <a href="https://suttacentral.net/sn22.58/en/bodhi" rel="nofollow noreferrer">SN 22.58</a> says:  </p>

<blockquote>
  <p>A bhikkhu liberated by wisdom, liberated by nonclinging through
  revulsion [towards the five agggregates]... through... fading away and cessation, is
  called one liberated by wisdom.</p>
</blockquote>

<p>About 'cetovimuttiṃ', <a href="https://suttacentral.net/mn29/en/sujato" rel="nofollow noreferrer">MN 29</a> says: </p>

<blockquote>
  <p>Yā ca kho ayaṃ, bhikkhave, akuppā cetovimutti — etadatthamidaṃ,
  bhikkhave, brahmacariyaṃ, etaṃ sāraṃ etaṃ pariyosānan</p>
  
  <p>the goal, heartwood and final end of the spiritual life is the
  unshakable freedom of heart.</p>
</blockquote>

<p>Now the terms 'cetovimuttiṃ' &amp; 'paññāvimutti' are a type of word compound where the translation is uncertain. Thus, translators such as Ireland &amp; Thanissaro have translated 'cetovimuttiṃ' &amp; 'paññāvimutti' literally as "mind-release" &amp; "wisdom-release". Where as translators such as Bhikkhus Bodhi &amp; Sujato have translated the terms interpretatively as "liberation <strong>of</strong> mind" and "liberation <strong>by</strong> wisdom". </p>

<p>Given the descriptions found in <a href="https://suttacentral.net/sn22.58/en/bodhi" rel="nofollow noreferrer">SN 22.58</a> and <a href="https://suttacentral.net/mn29/en/sujato" rel="nofollow noreferrer">MN 29</a> quoted above, I personally would agree with the translations of Bhikkhus Bodhi &amp; Sujato.</p>

<p>In other words, 'paññāvimutti' sounds like a 'means/method' and 'cetovimuttiṃ' sounds like a 'goal/end'. The meditator uses 'paññāvimutti' to achieve 'cetovimuttiṃ'. </p>
 2282: <blockquote>
  <p>I wonder if the difference has something to do with the permanent destruction (through vipassana bhavana) vs. the temporary destruction (through samatha bhavana) of the kilesas?</p>
</blockquote>

<p>Per the Pali dictionary, <a href="http://www.palikanon.com/english/wtb/b_f/ceto_vimutti.htm" rel="nofollow noreferrer">CetoVimutti</a> and <a href="http://www.palikanon.com/english/wtb/n_r/pannaa_vimutti.htm" rel="nofollow noreferrer">PannaVimutti</a> carry different meanings depending on context (restricted sense versus highest sense). In the highest sense, both are on the same level for they both signify the fruition of Arahantship. They're just different in regards to the specific pathway as a result of the practitioner's dominant faculty on either concentration or insight.</p>
