The biggest audio additions from the 1993 re-mix are the asteroid whooshing sounds, the re-done security camera things exploding in the cell block, and more gunfire in that scene as well. The garbage chute scene had more motors and stuff added and i think the sound of the Dai Noga hiding right before the walls start to close. I think the "here they come" sequence had a lot of extra sounds and sweeting done to it as well. Someone made a list with all the additions and theres about a dozen more minor ones but those stand out as the major additions.