There are only three differences between the 85Combat and the other CZs:
1) A firing pin plate rather than a firing pin stop -- and no firing pin block.
2) An ambidextrous slide release. (The right side is held in place by the slide stop spring.)
3) A right side safety. (Held in place by the spring on the top of the sear assembly.)
If you have complete take-down instructions from here on the site, those minor differences are irrelevant.
You really need a third hand when screwing around with the sear assembly. But the 85 Combat is much easier to work with than the decocker models.