
Are the following mentions coreferent?:
<m> unveils </m> in Apple unveils cheaper Ivy Bridge - powered MacBook Air June 12, 2012 Apple has chosen WWDC week to announce an update to its MacBook Air line. It may lack the Retina display of its newly upgraded, headline - grabbing cousin, the MacBook Pro, but the 2012 Air sees significant advances too. An upgrade from Sandy Bridge to Ivy Bridge processors with improved integrated graphics is chief among the upgrades, and onboard memory has also received a boost. 
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<m> unveiled </m> in Apple has unveiled the next generation of MacBook Pro at the WWDC Keynote in San Francisco. The 15. 4′′ MacBook Pro refresh will be remarkably thin, at 0. 71′′ and at 4. 46 pounds, it will be the thinnest and lightest MacBook Pro ever. The display is where the MacBook Pro refresh truly shines, with a Retina display at a whopping 2, 880 by 1, 800 pixels. 