My cz97 with rubber grips is the same thickness of my fnp 45. Both 1.28 in, or 32.67 mm's.
However the 97 is longer. Cz 97 55.37 mm, or 2.18 in. The fnp 45 with the largest blackstrap is 2.12 in, or 53.87mm's.
the fnp 45 seems to be more "blockier" than the cz 97(w/rubbergrips). In my opinion IF the cz seems to big, the fnp will be worse, even though it is a tiny bit shorter. Hope that helps