dose any one know if i can put a 2.8 v6 5v engine out of a A8 in my 100 avant the 100 orangly had a 2.8 v6 24v engne in it but the cam belt snaped and i dont know if i can put a 5v in it. dose it need a new ecu or will it just not work

if and one know please reply as there is a A8 engine on ebay but it only has 2 days to go

thanks mike