Technically the GOUT release of ANH created a new version of the film. They used the 1993 master tape and replaced the opening crawl with the version they had scanned for The Empire of Dreams. Before that there are 4 versions of the film and 5 different soundtracks. Most people focus on the the 77 vs. 81 crawl and C-3PO’s tractor beam line, but there is a lot more to it than that. Empire and Jedi are simpler, but there are still some changes. Nothing as drastic and the SE and following releases, but still, noticeable and documentable changes.