Vags are a bit of a mine field with engine numbers there are so many variations of them with engine blocks and cylinder head no.
I had an a4 with what was meant to be the better engine block number and best cylinder head no.
The car developed a small oil leak and upon inspection the engine block had a crack in it.
I really don't rate vag stuff much after reading up on all the problems you can have with them and for that reason I will never buy another one again.