Greg is getting this all sorted out.
If you're getting a newer P10C with a reversible mag catch, you'll need to make sure and order the new mags with yet another cut on them. According to the info Greg has (CZ doesn't even have the info on the website yet) part numbers for the new mags will be: 11421 (10 RD) 11420 (15 RD) and 11423 (17 RD)
This, besides the general great pricing and service, is why the universal recommendation for mags is to buy from gregcotellc.com!