Lucas has been making changes since 1977. Technically the films, as they were seen in the theater, have never been released in any form. For example, the title of the first film was changed be the time it came to VHS, adding the Episode IV part.

A title change isn't a change to the main part of the film. It's not in the story. As for other changes, most of it was stuff that dates back to the original different versions made in the first few months, not changes made years later. BIG difference from coming along many years later and making a whole lot of changes that don't fit with the original films.