Not sure about that, my switch is the exact same as the one i bought except is not illuminated and i have one less wire. So i think the wire has to do something with the illumination and the brake/parklight switch.
for mine it was the heated button wire, maybe its different because you are edm?
got pictures of both your switches?
fncone, i saw you already removed a button switch from the master switch, can you tell me what is the easiet and safier way to do it without damaging anything ?