the trigger on the current witness is completely differnt internally to the cz. the old witness designs were a duplicate of the cz.
the witness safety may or may not fit, but i'd guess you want the witness feature that allows the safety to lock things up with the hammer up or down. that feature requires that you replace the sear assembly, which appears that it would swap.
i have a new, never fitted witness sear assembly that's for sale if you want to try fitting this assembly to the cz.
let me know if you're interested, and i'll ship it to you for $45 including shipping.
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