My question at the begining was , "Is CZ the same as CS but better?".
After all you've said so far, would you agree to say that the final answers is : "YES" ?

I mean, from what I've read, CS has nothing more than CZ, and CZ has everything that CS has, with something more (single player more + some little better things in the multi-mode).
Am I right?

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Sorry for my sometimes-not-that-good English.