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The 3 wires are Power (ignition, on in RUN/ACC), Gnd, and the LIN bus. The LIN bus would normally be used when communicating the status of the Uconnect buttons on the mirror (if you had them), EC dimming (which again you don't have), and other things such as whether the mirror's software detects a fault.
Given that your mirror doesn't seem to have any of the advanced features, I would only be concerned that the body controller might be looking for the mirror to be on the LIN bus. I think I would try unplugging it, starting the car, and seeing if there were any faults indicated. If not, you should be good to go with replacing it.
Given that your mirror doesn't seem to have any of the advanced features, I would only be concerned that the body controller might be looking for the mirror to be on the LIN bus. I think I would try unplugging it, starting the car, and seeing if there were any faults indicated. If not, you should be good to go with replacing it.