If its got the motor and wiring to the motor you definitely have an ediff.

Regarding your previous service history, I reckon you should take it with a big pinch of salt 🤔

Yep I know the garage and do not either rate or trust it. There is no motor on the diff but it has wires going in and topix states it has an ediff and this garage apparently replaced the fluid with stated non ediff fluid.

Looking at the fill and drain plugs I don't think they have ever been out