TX_, ^^^^ what he said.
CZC uses the PreB disco and fits it for the full size 75s. I don't have personal experience with a compact. A practice range friend asked me about his Compact and I suggested contacting CGW with his preferences. He did, and I tried his trigger. VERY nicely set up for carry. Great SA pull and reset. Smooth DA.
Scarlet, my CZs both have improved hammers, all lighter springs (except the trigger spring), extended FPs and polished mating surfaces.
My Shadow has the CZC Comp Hammer and CGW short reset disco, while my 75B was worked on by David for his initial run of reach reduction triggers and has the SPO1 Shadow Hammer cut-to-fit my B by David.
My Shadow DA is under 5# and 2.4# SA. Haven't measured the B with a gage.
The CGW short reset disco is drop-in on "most" pistols. Some need a little fitting. I put mine in on my Shadow and it was a close fit. [The 75 Shadow didn't come with one when I bought mine.]