The VDO controller is for EA/CC/ISC (electronic accelerator/cruise control/idle speed control). The Bosch controller is engine management probably HFM-SFI (which stands for Hot-film mass air flow meter/sequential fuel injection). I say probaly because 95 is a tricky year and the ME-SFI has the same looking box. ME usually is associated with OBDII cars and the C class was the first one to be OBDII.
Trying to make an OBDII controller work in a none OBDII car will be daunting.
Bosch Master, ASE Master, L1
33 years MB technician