On the .50 cals, I think yes for the most part. Depending on how they were mounted, be it fixed or flex mount. Some had different barrels of course. But the core of the gun was the same, and if I'm not mistaken, still is the same. I believe I read somewhere that the aircraft guns had something lighter to make them have a higher fire rate, maybe the bolt or something.. not sure. Of course there were a lot of add on stuff like heaters, mechanical vers electrical cocking mechanisms.
Maybe someone can help you out with more detail info Chad but I think that's the big picture of it.
Wash looks good, clean up with you think then do some more...