Well both are still TT of the same generation In such shows it is not very useful to list the cars separately I think, as there are lots of cars (cf Top Gear & Fifth Gear)

No that's a different model, because this is simply a 1.8 T quattro, and the other one is a 3.2 quattro. And that is an older model, so it deserve a own page

I think it is, indeed

Isn't it the same as http://www.imcdb.org/vehicle_147138-Audi-TT-Typ-8N.html ? If so, I guess it should just go in the comments.

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There is an Audi TT 1.8 T quattro (Typ 8N) (3 stars***) in Best Motoring
http://www.imcdb.org/movie_1004509077-Best-Motoring.html?PHPSESSID=1d6a7eee3309b920556100b063031301