yes the 18 round mags will fit and work fine

Hi Juan, All CZ 75 full size models, incl. CZ Shadow 2 and CZ 75 SP-01 models use the same sized magazines. Different models from this group will use different magazines from factory, but the difference is only in materials used, or mag pads. I.e. you can use CZ 75B magazine into CZ Shadow 2 and it will work without issue and will have the same size, thus it will not exceed the frame. The difference will be only in the material of the magazine (aluminium vs nickel) and the mag pads.
Magazines for CZs in this group come from factory in different capacities:
16 rnd magazine with standard metal mag pad,
17rnd magazine with slightly extended mag pad,
18rnd magazine with more extended polymer mag pad, and also
19rnd magazine with even further extended mag pad.
All these magazines can be used in full sized CZ 75 models:
CZ 75B models, CZ 85B models,
CZ 75 SP-01 models,
CZ 75 SP-01 Shadow models, and
CZ Shadow 2 models
budsgunshop.com/product_info.php/products_id/23060/cz-usa+cz+75+sp-01+magazine+18rd+9mm+blued+steel ,
.
Stay safe & have a great day!

Hi Juan and welcome. CZ 75/85 mags fit the SP01 series. Good details here: https://czfirearms.us/index.php?topic=66927.0 ---------- Cheers, stay safe and enjoy!