early Corrado/Passat mirror loom will fit yeah, only slightly different at the A pillars but the connections to the motors and the switch are the same. in fact you can use the motors too!
later setup I'm not so sure will work, motor wiring will prob be same but switch might be different. the early corrado/passat switch is the same as the MK2 switch, just has a different knob on it. later one is a different shape