I recently got a new laptop for work, and I was wondering whether it'd be good practice to keep using the same RSA keypair as I'm using on my old work laptop. I'd really like to not have to create another keypair to keep track of. Is this, generally speaking, an acceptable practice? Since the keypair does have a passphrase, it should be fairly secure, as long as my physical machines are secure, right? 
Good practice to use same SSH keypair on multiple machines?
ssh;security
Yes, it is safe as long as it is in safe hands i.e. physical machines are secure. Of course, if an attacker gets access and is able to ssh into one machine, he can then get the key from that machine, and use the key for other computers as well. See this for more information.