Best way for both of you to know for sure is for each of you to take a mirror off the same side of your vehicle (regardless of which is considered the "drivers" side) and look at the electrical connector. If both have the same colored wires at the same pinouts, you should be good to go.
If they are different, someone with a JDM model factory electrical manual would have to chime in about any differences.
In the US version, both the right and left mirrors appear to have the same wire colors in the electrical connectors.
Left Door
Connector D-6 (Directional motors)
Pin 1 - Red
Pin 2 - Black
Pin 3 - White
Connector D-7 (Heater/Defroster)
Pin 1 - Black/Green
Pin 2 - Black/Red
Right Door
Connector D-15 (Directional motors)
Pin 1 - Red
Pin 2 - Black
Pin 3 - White
Connector D-16 (Heater/Defroster)
Pin 1 - Black/Green
Pin 2 - Black/Red