B-Body/A-Body bucket seats

I don't know if anyone has mentioned this, but I have a question about B-body and A-Bady bucket seats. I was told many years ago, that they were actually the same except for the cover design, and the seat runners. Does anyone know for certain about this? I'd like to do something a bit different with the bucket seats that I just purchased, and use a B-body design on the seats.