Robini, if I have understood you correctly, you are interested in why some A330s are using more runway than others.
Unfortunately the take off calculations do not tell us how much runway we will use before lifting off. Therefore I think it unlikely that anyone will easily be able to answer the question to your satisfaction.
Our performance calculation for Gothenburg gives V1/Vr speed for flaps 1 around 160 knots for both runways. So we are accelerating to a higher speed than the minimum we could use to get airborne, which would be around 130 knots using full thrust and flaps 5 on the 737NG.
Other posters have indicated that there are many factors which can make a difference. Going back to your original comparison of the A330 200 and 300 you have spotted an interesting difference.
Maybe you should target you question at Mytravel pilots on the Nordic forum. But again I am not confident you will get much further.