CMT2300A importance of GPIO2 and GPIO3

[ortegafernando]

Hi, I have read a lot of information about how to connect ESP32 and CMT2300A.
I have found diferent pinouts, the main diference is about mapping or not mapping GPIO2 and GPIO3 of CMT2300A.
Some declare "-1" (not connected) and some declare with 19 and 16 pin numbers.

What are they for? Are they important? Why json pinout mappings declare them but in all discusions and schemas almost everybody let them disconnected?

Thanks a lot.

[ortegafernando]

Hi, anyone? Thanks