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If you're still considering swapping... Yesterday I successfully swapped the driver and passenger side lumbars. There is a difference between the two- I found this info on another forum:
"My drivers side was different from the passenger side in that it had limit switches on the gear covers which were plastic. The passenger side has metal covers. I swapped covers from side to side and also swapped the central metal dowel out from side to side. The plastic cover has a longer dowel pin in center. Other than that the two sides are identical. Once you swap the plastic covers and dowel pins you are ready to reinstall the mechanism. Not sure why the passenger side doesn't have limit switches like the drivers seat. If the limit switches are there to prevent the gears from breaking--they don't work."
That said, I did not swap the gear covers on mine, and everything works fine. The limit switches, as the guy put it, seem to do nothing at all. There were two additional electrical connections for these on the drivers side, so I just taped them up and tucked them away. I tested all functions of both seats and everything is good. Took about an hour altogether with just a flathead screwdriver and needle noses to release the clips.
Many thanks to @Aerocoupe for the terrific writeup.