Physically swapping it is fairly simple, however the auto mirror has a bunch of extra wiring. It has power obviously, but from memory it also has switched ignition and illumination, so it only activates when the car is running with the lights on. Theoretically it should be possible to find these in the roof from the sunroof motor and switches but I haven't tried it myself - I've only retrofitted the entire harness as I was doing the side mirrors as well. The interior mirror has an output which drives the side mirrors.
I have a wiring diagram for it somewhere from when I retrofitted one...
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