Both are defo 12V and you have that at connector which is correct, I don't see how you have 3/4V was this measured from the valve itself or at ECU end?

Measure voltage across the connector with ignition on should be +12V if lower here indicates earth fault which is switched by ecu (Could just be poor wiring) if this is good would suspect a faulty valve.

I'm not sure on your car but can't see any reason why a amal can't be used unless different electronics/resistance.

Martin