I don't advocate this for other applications, but the Pro-Mag CZ-75B mags for the .40 compact work perfectly in the 9mm model, and have been trouble-free for many users on the CZ Forum. (I started using them years ago, when the hi-cap mag ban was still in effect.) They'll hold 13 or 14 rounds, depending on when they were made. Most hold 14. Almost as good as a full-size mag.
Before you start slamming and gagging, I'm speaking from long experience. And others have had good luck with this particular type of Pro-Mag, too. Check with other users here on the this forum and on the CZ Forum as well.
I do not and will not use Pro-Mags in full-size CZs.
If Mec-Gar ever gets around to making mags for the Compact CZs, they would be my first choice.