Thanks for this, but as suspected the wires are different.
I did however figure out that the second wire (grey) and last wire (black) are the ones needed to tap.
The grey wire is switched ignition and tied into powering the interior overhead lamps (front and rear). The power cuts after 10 minutes to save battery.
20 min later edit:
What I just realized after I finished up was that when the engine is running and interior lights are off the mirror isn't powered in

Back to fiddling with the wires and see what is what.
Now on to install my new frameleas homelink autodimming mirror! Post with pics coming later.
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