I recently bought a replica CO2/BB CZ75 because they don't make a replica P35 and I thought the CZ was as close as I could get. When it came, I measured both (P35 and CZ replica) with dial calipers. The critical dimensions of grip width and trigger reach were amazingly close, but the CZ feels noticeably fatter in my hand. I don't know why. (Overall length and height are also very, very similar.)
The CZ's grip has a few more degrees of angle than the P35's, as is evident from the above picture.
The CZ's slide, from the front of the frame back, is a lot fatter than the wonderfully slim P35 slide. Not as fat as a Glock's, of course, but fat enough that it won't go into the old Bianchi M66 holster I keep my P35 in. (The M66 was made primarily for the 1911 but holds the P35 quite nicely as well.)
I enjoy shooting the BB C75, but it's not an exact understudy for the P35, as my CO2 1911 and M1 carbine are.