I'm pretty sure with the W201 model the speedo-gearing in the transmission is the same(even for automatic).
So if your using the same dif/wheelsize, your fine.

Its the speedometer that is different, having a K number. (For the W201 1.8 there 7 different odo meters (not counting the miles version))
Howto speedometer: 190Rev.net - Discussion for Mercedes-Benz 190E W201 Performance, Parts, Tuning and more