Rear wiper motor compatibility

Hi, having problems with rear wiper on my 54 plate a3 1.9tdi, it has stuck, I checked fuse and that's fine , so I popper off the tailgate plastics to reveal the common issue of a leakage. The contacts were wet so I cleaned them up and tested it, still no joy, popped off the plate covering the mechanism and it's all clogged up. Decided its going to be a lot easier to replace anyone know about the compatibility between part number 8E9 955 711C and 8E9 955 711B? Few going on eBay but they all seem to be B's they look near identical but wasn't sure

If anyone could confirm that would be great!

Thanks

Thanks for the replies guys, there is a wiper motor on ebay but it doesn't say the part number its off a 2011 a1 would that be the H model? Are they the same across all audi's say from 2000 onwards? 25 quid! Wish I had of known it would have fitted, I would have happily paid more than that!