Yes it is possible.
I took a pair of '91 740 SE rear lamps and put them on my '88 740 GLE saloon.
The wiring was all different colours so took a bit of poking with a multi-meter to find out which wire to connect to which as they have different connectors (so make sure you get the connector with the new lights).
Also, there is a bit of metal that needs removing from the rear panel. basically an upright strip of metal between the 2 sets of bulbs in the old one - this will foul the new ones. I just chopped it off with angle grinder (cover your paintwork though... i forgot and had rusty metal flecks in the paint after that).
Also, the bit of metal you chop out will have the earth point in it, so don't forget to create a new one. I took the paint off surrounding one of the bolt holes for the lamps and put the ring connector under that.
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