Not exactly, though, because the two instances are done different from a stylistic perspective. Those scenes in the original trilogy aren't treated like nostalgia or anything special. When you first see Chewbacca, there isn't this lingering camera on him or a huge emphasis on his name. In Revenge of the Sith, remember the, "And goodbye.... CHEWBACCA!" just to make sure that those of us who didn't recognize him would be sure to do so. So, yes, while someone watching them for the first time in numerical order (makes me want to cry thinking about it) will see those and realize it, they weren't created with that purpose in mind. I doubt even Mr. Lucas would deny that.