If they used a different source for the International Cut, it doesn't really show. The international version appears to have slightly different cropping/framing but it still has all the issues with poor color, blown whites, and crushed blacks that the Director's Cut displays. The UK theatrical edition shows a lot more detail in the light and dark areas and, according to reviews, the color is more accurate. I don't have a film print to compare with, but the overly-boosted contrast is obviously not correct.