ABS ECU used buy, differences in versions and costs

Servus together! On the weekend my moose got caught, the lights for ABS and Tracs go sporadically on and off. Previously always accompanied by a Surren, sometimes from the back, sometimes from the front. Now I want to buy a used ECU, install and solder mine. What must I pay attention to? So far I only saw that there are ECUs up to ́95 without Tracs and then from ́96 with Tracs. Are there any other differences? What can such a used ECU cost? I have the choice between 30 and 300 euros in the bay. In the SuFu I have read across, there are also some instructions, but I have not found any answers to my questions. My moose is a ́96er 10V 144PS with Tracs… who has a functional or even revised module, can also offer it to me.