Well the Seat Exeo IS a B7 Audi A4 so it would be the same part.
That's not even an exaggeration along the lines of "all VAG cars are the same". I mean VAG took the B7 platform A4, replaced it with B8, and continued releasing B7 A4 as Seat Exeos.
So following that logic, it should definitely fit.
Nice little tidbit for the Audi snobs out there