I'm not too sure ref inter-swapping of common parts from different plants. I have a hazy memory that B24 Libs built in differing locations had a singular lack of the same key dimensions or fittiings of some common replacement part. It became an issue that could only be resolved by retro-fitting a shedload of a/c. Like i said, hazy recollection. It wasn't widespread but it certainly did happen. I also think there were one or two issues with early Sherman versions to the point upgrading with later variant parts wasn't an option. Again not 100% but its ringing a bell.