Multiple alts, same class!

I'm in the interesting predicament of having two priest alts, specced almost exactly the same. One was leveled in conjunction with a DK from 55 up, primarily as holy, before the advent of dual-specs. The other leveled primarily shadow with a feral druid, and picked up discipline as a second spec somewhere in the 50s or 60s. The first started her raiding career as a MC-priest for Razuvious; the second dived headfirst into the raiding scene at.. TOC-10, I think.

I'm a decent priest healer as discipline. I'm a terribly holy priest for a lot of the same reasons I'm a terrible resto druid (even ignoring the lack of practice!). I'm.. well, shadow and I are still talking. I don't understand shadow as well as I should, I don't theorycraft it. I rarely have the opportunity to raid seriously as shadow, but when it comes up, I know what I'm doing and I have the gear for it (at least sort of).

Where am I going with this, my priesty ramblings, you may ask?

I play my priests very similarly. I'll occasionally forget which priest I'm on - I know that Amh is stronger, has better regen, has the 2pc bonus. My head knows that; my fingers don't. I'll look for my flash heal hot and realize belatedly it's not there. I'll go to switch to a better regen trinket and discover that I haven't gotten one yet. One keybind is different between my priests - holy nova - and especially when going from one to another, my fingers will instinctively hit the key for the other priest's nova.


Question of the week!
If you have multiple characters of the same class/spec, how do you get your fingers and mind to come to terms with the differences - or are there any? What's your solution?