Where is this pin connector that you are talking about? The only difference should be the bulb. IIRC, the headlight and fog are in one housing. Oh I think I know what's going on. You removed them from a '94/'95 E320 and there is only one connection on the outside of the unit, is that correct? Can you post a pic...then we could probably be a little more helpful.

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1995 E420 152k
1991 300D 2.5 348116 daily driver
1992 300E 2.6 196k-work in progress(head gasket)
2002 BMW 745Li 93k