So he obviously uses the same engineering as Airazor, and has the same legs from knees to ankles. I'm not seeing any other part reuse though.
I think the beast mode mostly works pretty well. They were never going to manage a beast mode as slim as the show model and still have a decent robot mode, so the bird chunkiness doesn't really bother me. I do wish they could have done something about his feet though. Gonna have to play around with Airazor a bit and see if there's a way to get the feet into a better position.
Edit: Realized I still have Skywarp sitting out in eagle mode. Seems like the best you can do is just pose the lower legs straight, fully folded against the thighs. Not great, and will make the beast mode read as even chunkier still, but decent enough I guess.