  Systematic comparisons of jet pair correlations obtained in Cu+Cu and Au+Au
collisions at $\sqrt{s_{NN}}=$200 GeV are presented. The measured jet-pair
distributions for both systems, show strong modification of the away-side jet.
For the same number of participating nucleons, the modification does not show a
strong dependence on the collision system. It is suggested that such
comparisons can provide important constraints for models which predict specific
path length dependent jet modification effects.
