Pins for AUX and M0 and M1 ESP32

As per title. I was just wondering what pin I can use instead of the one that you mentioned in the example, for AUX, M0 and M1. I'm talking about the E22 Ebyte lora module. I was going to use for AUX pin 13 and for M1 pin 4 and for M0 pin 25. Is it possible? They are not just some pins to get and set some configuration? Because I know TX and RX is better to use the hardware serial, but for the rest can you use some available pin?   Thanks! By the way great library!