Regarding your Datacard from your introductionthread you have ME2.8 in your car. W210 had ME2.8 from Modelyear 2001 and newer - which is good.
Question is - what has the Donor Mashine? What ECU? Do you have a Picture of the ECU? if it is not ME2.8 you cant use it in your car.
TCU? Is it EGS51? Or is it EGS52?
Transmission? What Code does the Transmission have?
greetings, Fabian