While CATSFC is based on Snes9x 1.43, it has tons of modifications and optimisations to make the emulator run faster. It was originally designed for the DSTwo cartridge, after all. It's quite heavily optimised. The same goes for pocketSnes, which is based on Snes9x 1.36 and even more heavily optimised.
It's quite misleading to label it as simply a revision of Snes9x from a certain year, because they aren't. And also does a bit of a disservice to the developers who worked on CATSFC and pocketSnes.