Most of the parts are interchangeable, but because some models are decocker models and some aren't, there are issues. Sights on the B models all use the same dovetail, but the sights on some models may need part of the rib on the top of the slide removed before or behind the dovetail. Older CZs are sometimes compatible, but sight dovetails on the oldest ones can be drastically different, and front sights on some of them are staked, not dovetailed.
Barrels on the compact models have two locking lugs, while barrels on the full-size models have three. Converting a decocker model to use a safety, or vice-versa may not be easily done -- and would be pretty expensive just in terms of parts. The mag releases on some models are different (with newer ones being reversible). The straight single-action triggers (several different variants) can't be used in a double-action gun unless it is converted to single action, and you can't add an ambi-slide release to a non-ambi model, etc. Some modifications take an experienced gunsmith.
Parts swaps between most decocker models ought to be possible, but I'm sure there are other differences that I don't remember.
Your question is even more difficult than you think, as CZ-USA is just about the only source of parts for the newer models.
I think there's a new OMEGA trigger assembly which is apparently a major improvement. I have no experience with it, so don't know how easily it can be installed or swapped out. You need to join the CZ FORUM and ask questions there.
http://www.czforumsite.info/index.php Angus Hobdell in the ASK ANGUS area would know, for sure: he's a CZ employee, and head of the CZ custom/performance shop -- and a highly regarded/ranked IPSC competitor.
Check wtih CZ-USA before doing anything drastic.