Here'* what I found out... the seat swap is in (almost).
The seat pan frame is identical on both seats. The LeSabre has an extra bracket mounted to the pan frame that holds the power seat controls. The seat controls and wiring connectors mate correctly with the Olds seat, and the sheet metal screws holding the bracket on the LeSabre seat pan frame went in nicely to the Olds seat pan frame holes, which are drilled the same as the LeSabre.
So, I cut the fabric on the seat cover, mounted the bracket to the seat pan frame, fished the wires between the frame and the seat pad, connected everything back up and, voila! The seat now goes up when you push the control down!
(fore and aft are OK) So, I guess I should see if the individual connections on the big connector can be swapped around until everything works right. Since Fore and Aft works OK, it wasn't just a matter of getting the control upside-down in the bracket.
FYI: The LeSabre had a small molded 'void' in the seat pan padding for the wires to go through that the Olds seat didn't have... It doesn't seem to matter that it is not there.
I hope this helps someone else! BTW: It was easier than finding another seat.