Dang! - that's tricky and inconveniently pedantic.
Just for comparison purposes, the engine number of my MY 2005 Gti (Japan) is 034227.
Do you have the original Jap service book/manual? If you do, check the front section (0503.553.190.70)* inside rear cover. This includes some fill-in data boxes - the third line of these would include the engine number (after prefix AVY) if the supplier bothered to make entries.
Here's hoping.
David.
*Maybe different number depending on MY