Audi A6 2002 Comfort Control Module Issue

Hi, i have friend and his comfort ECU got bad water damage, he sorted the wire but module still no good, he seen a used one on ebay that say they plug and play but the last digit of the ECU is different. I was wonder if they are interchangeable? If not is it something easy sort with Ross-Tech?
The ECU No. is 4B0962258K and the used one ends in H.

Thanks in advance.