I'd probably just splice a power wire off the driver side seat and run it to the passenger side seat, and just cut off the mis-matching plug and wire it directly. I guess there's no power wire on the passenger side at all? If there is, but the plugs just don't match, you can try getting a new plug (doubtful) from the dealer, and cut off the old one and hook it up to the spot you cut off, then plug them together. It'd be easier, if there's already a plug, to just cut off both mismatchign plugs and wire the wires directly together.