45LC-Man
Some of the parts may be interchangeable, but I don't think the majority will interchange. I've seen them, and it's just a different animal. For example, everything from the trigger to the hammer and firing pin is different, the frame is cut different. I think the key to parts interchangeability is to concentrate on 1911-A1s made by major manufacturers. Even then, things like beavertails won't interchange. And you need to be careful about the different locking mechanisms, like finding out whether it's got something like a series-80 safety.