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I believe they share some parts with the Shadow2 (fatter frame). I put a Shadow2 safety on one of mine.
Super good shooting pistol and I believe is like an ounce heavier than an SP-01.
I believe they imported approximately 1500 of them. Another one almost identical is the 99041 of which they only imported about 500. The 99041 is marked as a P-01 instead of a 75 Compact on the slide, but they're the same pistol. I believe CZ sent a new run in in the last couple months. I want to say it is a 99061, but can't remember for sure. Same exact thing as the other two.
I want to say Cajun Gun Works has a slot on their sight where you can choose "P-01 steel frame".
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All P-01s even the steel ones (use the same mold to save cash and maintain parts compatibility) have the thicker upper frame which the S2 later used.
No way is even a steel frame P-01 heavier than any SP-01 as it is the same thing but shorter in 2 dimensions despite a slightly increased girth in part of the frame.
Basically CZs have 3 frame types
"Slim" which is what the SP-01 has, uniform thickness throughout. I'm not near my notes so don't have the numbers but I want to say it is in the .9xx range.
"Thick" which is what the TS, TSO, CM use. About 1/16" thicker and uniform throughout, to accommodate thicker mags and add weight. Slide profiles on these are typical CZ75 though so look mismatched from the front and rear with a bit of a ledge where the frame is proud of the slide.
"Mixed" which initially was just on P-01s, guess they felt the need for more material near the rails to make up for using aluminum. The thickness is normal in the grip area so standard grips can be used but near the frame rails and where the safety is the frame is about 1/16 thicker like the TS/TSO dimension. When the S2 came out they also adopted this method (for increased weight while retaining grip compatibility) while developing a new slide that is heavier and tapers to meet the thicker frame flush.
A bunch of 99041s hit the market earlier this year too, for a while they were dirt cheap there were so many. Then they dried up again and prices shot back up. No telling if there will be further releases and if so, when.