I had a CZ-40B and found that most CZ (and aftermarket ) mags made for the CZ-75B .40 or 9mm would work in the gun. This seems to be true with the 75B in .40, as well.
I wouldn't bother, however, since you can get EAA Witness .40 mags from CDNN pretty cheaply, and they'll work.
(The EAA Witness often have to be "tweaked" because Witness seems to have their release positioned just a tiny bit lower than the CZ. When used in the CZ, their mags jam up against the slide. A needle file or Dremel fixes the problem.)
But with 9mm hi-caps, you aren't likely to get 13 rounds in there. Maybe 12 (or less.)