Harmy said:

Well, because the recompositing in those SW scenes didn't change the look of those shots as significantly as it did here (where it did change the look significantly, the shots were also replaced - like most of the fighter explosions in the Yavin battle).

And the shots in ESB are not simple GOUT upconverts either - just go ahead and compare these shots to the GOUT.

OK, and I apologize if I seemed to belittle your efforts by saying "GOUT upconverts". I see now there's a lot more work going on there.