Date registered: Jan 2013
Vehicle: 90 350SDL, 98 S420, 97 SL500, 94 S420, past owner of W108/W112/W114/W123/W124/W126/W140 & W220 cars
Location: Tampa, FL
Mentioned: 8 Post(s)
Quoted: 631 Post(s)
The motor should be the same between the two chassis, I believe. The difference will be in the cable. You should be able to look at them and tell.
And yes, while it's expensive, you can buy a lifetime supply of sunroof lube (and you should!) for about $35 from the dealer.