I think Duel is available in Europe. Heheh, if you have a region-free player, I think you can get it through Amazon UK. Maybe.
Oh, I agree that Spielberg's treatment of Close Encounters is different than George's treatment of Star Wars.
It's worse.
George believes in the changes he makes. Spielberg added that whole 'inside the Mothership' scene that he personally hated just to appease the studio into allowing him to make the changes he really wanted.
George is releasing a substandard quality version of his original 1977 film, perhaps with recreated elements such as the opening crawl to approximate what existed in 1977 (and, yeah, likely ignoring all the soundtrack differences as irrelevant.) Spielberg has never released, and as far as I know, has no intention of releasing the original 1977 version of his film, in any condition whatsoever. And the Criterion Version which claimed to be original, with Spielberg's blessing, was not.
Yes, very big differences.
As a filmmaker, Spielberg is light years ahead of Lucas. But as a self-censorer and second-guesser, Lucas is actually less objectionable. (Gadzooks, I can't believe I have to say that, but it's true.)