[W126 Coupe] Seat help, semi-Emergency!

[Shayegan, Richard]

Ok, so I was going to swap the tired old seats in my 1985 380SE with the ones out of an early 1987 420SEL. They seemed similar, the place said they could swap...and they can...except for all of the wiring. The old and new driver's side both have memory, yet none of the wiring matches. The new passenger side has memory and the old one doesn't.
 
Two question: 1 - which would be easier, swapping all the wiring/motors or taking the leather/pads/springs from one and putting it onto the other? 2 - How do I go about doing whichever is easier? I need this to be done, at least the driver's side, by early Wednesday morning.

Thanks,
Richard