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Mags and aftermarket stuff will fit. My gripe is the CSA safety moves opposite of the CZ rifles and is a bit of a bugger to switch from safe to fire quickly.
The platforms are compatible. For the most part, the parts should interchange. I too find the safeties turning the opposite direction on them a pain as it messes with your muscle memory if you own both brands. The CSA does seem like a beefier build and is heavier than its CZ counterpart.
The CZ's are the Military grade Vz's made from military stocks, I have seen two in person that have been to the gunsmith to get drilled for the rail. I would rather have the railed dust cover.
Dont worry the 858 is beyond tough and battle tested unlike the CSA version(stiring the pot slowly)
You'll find some fitting with things like handguard rails and mag-well adapters.
Cz858's can be drilled and tapped to have the side rail, but the CSA carbines were designed specifically with that side rail and POSP scope mount in mind.
FSNs are a wild card! We don't see enough of them unfortunately.