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On the W126 anyway the motors are the same us vs euro, but there are two different gears inside that change the sweep. Electrically they are the same, and if you switch the sides they will still run fine, but the squirters won't fire anymore. (That's what the 4th pin is for). Is there a wiring diagram on the motors themselves? My W126 motors have that, with wire colors.
Perhaps look at the wiring diagram for a late W124 and compare it to your early car.
-Jason
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket 
Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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