That is correct
The CZ 75 Compact, PCR and P01 will accept 10 round and 14 round mags which will fit flush with the bottom of the grip. They will also accept 16,17,18,19, and 26 round mags made for the cz75 either CZ or Mecgar branded. Anything over 14 rd mag will stick out from the grip. For the 16 rd mag, you can get a SP01 basepad that will fill the gap. There is not any spacer made for the Compact for anything above the 16 round mag.
However, if you?re really worried about the gap, you could purchase a +4 extension from CZ Custom shop and install that on your 14 round mag and that will sit flush to the grip and give you 18 rounds.