Regulator

Hi again.
The wiring diagram for my Serveta (12V - no battery) shows a regulator. I have a spare ducati/brevettato 3 pin item off another scooter (
). It’s marked 12V 14Arms and the pins are marked G, G and earth. Is it usable on the Serveta?
Thanks
The wiring diagram for my Serveta (12V - no battery) shows a regulator. I have a spare ducati/brevettato 3 pin item off another scooter (

Thanks