Hello people I'm new to this site, hopefully some one out there can help me.

I am have great difficulty finding out about the compatibility between AFN and AHU engine codes. I have an Audi A4 tdi with a 110 AFN engine(broken) and when I ordered a replacement from a breakers they delivered a 90 AHU engine,

They say that the engines are the same and that all I have to do is change over my existing turbo and exhaust manifold and the AHU becomes an AFN.

Is this true? I don't wount to go to the trouble and expense of changing it over to find it's not true but I can't seem to find anything definite,

Any answers or suggestions would be much appreciated,

Thanks, macspud28