Tryed!
Maestro - Endstop pcb
1 Stop - S
2 3.3 No pins
3 GND - V
launching M119 appears "not stopped"
clicking on endstop " at max stop"

@dc42 Thank you i'll try

First of all, dc and veti, thank you for your interest for my stupid question
Board appears exactly like the photo, there are spaces but not fitted.

Weel i will try in that mode, it's correct?
Maestro Pins

1. STOP -
2. 3.3v - No pins
3. GND -

Connect 1-3 pins to "random" pins on pcb and try command M119 to understand if is NO or NC

Probably a stupid question, but being a rookie and be afraid to fry everything , I ask for an help.
I tried to look for an answer, but without success (or at least not a sure answer).
With this type of endstop (from a cr10), is my hypothesis correct?

Maestro - Endstop PCB

1. Y stop - V pin
2. 3.3v - S pin
3. GND - no pin
   and use "normally closed" setup