Initially the SNAPZZ Modules are 22x30mm. By extending the Chip Family i can get rid of the Flash chip and get plenty more PCB space.

This lead me to making a new size - 22x22mm. To stay compatible with the original base (mount) with 30mm lenghts i added a breakaway section. So it can be mounted in a 30mm length mount, but also in a 22mm lenghts one.

This specific board is using Espressif ESP32-pico-v3-02 Chip. It contains both Flash (2M) and RAM (4M) in the Chip.
Another name thing here is the -PRO Suffix. Essentially telling that it contains the EEPROM Chip (U2)