I did a quick check to be sure, Alien Resurrection special edition features a very long shot at the beginning outside the large "Star Destroyer" spaceship and ends with a really badly done CGI bug that a guy squishes inside some control tower cockpit at the end of the ship. The new ending is a scene of the small spaceship landing on earth in rubble, Ripley and Call have a longer conversation sitting on rubble about what they'll do next and the scene ends with a long CGI shot of a destroyed Paris.
Alien III is a much better version which shows the rescue crew on a very desolate beach looking for survivors, there's maggots everywhere. They then pull the Lifeboat ashore with some oxen. Latter they show a slater house were they bring a oxen that dies mysteriously, after they leave the chest burster punches through the ox and falls out on the floor. Next comes the Bambi Alien scene with the newborn Alien slowly standing up on wobbly legs, this alien was fully designed by H.R. Giger. The Bambi Alien then scurries off down a corridor.
Later you see a few more scenes added into the film with more dialog. The other big part of the film edited out was a subplot with the lunatic that shows why he freed the Alien once they contained it in that sealed room.
I should also mention that the dialog for the extended scenes had to be ADR but they didn't bother because the studio wasn't going to release the movie with those scenes in theaters, so the Audio is the original recordings done on set. As a result, the extended scenes for Alien III have a distinctive audio recording that makes it difficult to hear the dialog.
The only films in the set that have true directors cuts are Aliens and Alien III. The other two films were put together by the studio just to make special edition versions for the Quadrilogy.
Something's that were revealed in the Documentaries: Alien Resurrection was originally going to have the small spaceship crash on earth with some aliens and I think the Newborn Alien and have the cast fight them off in a forest. Alien III was originally going to take place on a large Space station made mostly out of wood. And Michael Biehn was anticipating reprising his role as Hicks in Alien III, but when he found out they killed his character he was so pissed that he wouldn't let them use his likeness as a dummy that was killed on the Life boat so the production crew had to hide the dummy's face by having a large beam come down and smash Hicks' face in. Also there was a much longer and gruesome scene in Alien III of Newt's autopsy that was so realistic that it had to be edited down much to David Fincher's dislike. And the studio really treated Fincher like crap on Alien III, none of the other directors on this series were treated so badly, that's why Fincher doesn't make an appearance in the documentary or on a commentary track.
I'm also a fan of Alien III, it's not my favorite of the series but it doesn't come in dead last with Resurrection and Alien vs. Predator.
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