After reading through this thread I didn't see a clear answer to the OP's question. It has nothing to do with being an SA per se but all 40 cal B guns have the full with slide all the way to the end, only the 9mm ones are narrowed at the end.
As far as holsters, especially for competition, i strongly suggest Bladetech. They make great stuff and they make a holster specifically for the CZ 75 SA in .40.