Not exactly a 75 Compact, but a hybrid of the Colt Z40 and the CZ P01. After all CZ had to do something with all those Colt stamped slides after they backed out of the deal...
Maybe you meant "some leftover slides from the CZ-40 and later 40B model runs."? Some of us called thought the 40P a "frankengun" -- if only because you couldn't get a Kadet Kit to work on it. (I don't think the 40B-like slide and the P-01 frame looked like they belonged together.)
CZ ought to bring back the 40B in a 9mm version (9B?) as I suspect they'd sell quite a few of them.
Back in the day, at least one barrel maker (Bar-Sto) offered a 9mm barrel for the 40B, but there weren't a lot of 40Bs (or CZs, for that matter) being sold at that time, which mean there was an even smaller market for conversion barrels. I traded my 40B away, an action I have long regretted. (It took me a while to get comfortable with .40 S&W guns. (I now like them...)
A lot of us liked the 40B's 1911-like grip style. I would love a Colt 40Z (but for it's rumored glass-smooth DAO trigger, not for the Colt name.) I think there were a few DA/SA Z-40s, too.