Not according to wikipedia

http://en.wikipedia.org/wiki/American_Pit_Bull_Terrier

http://en.wikipedia.org/wiki/Pit_bull

http://en.wikipedia.org/wiki/Staffordshire_Bull_Terrier

In fact, now that I've looked at photos, there is a significant physical difference. Or maybe it is just those photos. I've never really done research on the differences before so I'm not the all-knowing guru, but I know there will certainly be some here that will be able to tell you more specifics!

EDIT: Ah, it seems as though "Pitt Bull" is just a general term coined to include several of the bully breeds, but it isn't technically a breed itself, if that makes sense? I'm learning, too!