Sorry for the late posting, if anybody's still following this thread.
I have a CZ75B in .40 S&W, which came with 2 Mec-Gar 10 round mags from the factory. Of course, they function flawlessly.
Recently I purchased 2 10 round mags from a dealer who promised CZ factory mags and sent EAA Witness mags. They also functioned flawlessly. However, they don't slide into the CZ75B mag well as easily, hanging up a little in the area of the mag release. A little jiggle and they go in. The followers are of different design, but both types hold open the slide after the last round. The Witness mags extend ever so slightly, being about 1/8" longer than the Mec-Gar mags, and have slightly bulkier butt plates.
I've read a lot of feedback in the forum about using Witness mags in the CZ75B, with some saying that the Witness mags need a little alteration around the mag release slot because the slots are positioned a little differently. That may be the case, but my Witness mags needed no additional fitting at all to function. I don't own a Witness, so I don't know if the reverse would be true.
Good Luck with your list.
ED