The first pistols we saw made this way (looked like a P01 but had the steel frame) were labeled CZ 75 Compact on the side of the slide. They don't look like the regular CZ 75 Compact and folks got to calling them SP01 Compacts. The second bunch that hit the US market were labeled P01 on the slide, even though they have a steel frame.
CZ is the "Heinz 57" maker of handguns, it seems. Things are always getting "mixed up", like a mixed breed dog. Which are pretty darn good dogs most of the time. After having a mix of pure bred and "Heinz 57" found and dog pound puppies over the years, I just get the Heinz 57 breed dogs these days.