Admittedly I'm guessing here but if by throttle valve you mean the throttle body then as far as I know a replacement would need coding to the car where the repair kit would mean you keep the original throttle body[just repaired with the kit]and so don't need it re-coding.Recoding would of course add to the cost.
As an aside[and I could be way wrong here]I thought the d4 was a diesel engine? but you state it's a petrol?
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