No.It`s the headlight lens that has a LH and RH traffic version-all other details are identical on both sides(and all countries AFAIK).
The base(socket) in question is #187,right? ( A 000 826 25 82 )-it`s the same on both sides,and both Bosch and Hella(#90 293) versions have the abovementioned Mercedes-Benz part number.-spring loaded plastic socket with 58 and 31 terminal connections.(it`s on my desk now).
Good luck!

Useful site:
http://www.detali.ru/cat/cats/?cat=mb