After listing to the 1989 LD soundtrack some more it’s clear it is a remix. The optical track seems to be the only option for original theatrical sound. Here is a perfect scene to compare all 4 soundtracks:
After the ark is opened and Toht is laughing, the generator starts whirring and the lights explode. Then the Ark starts humming ominously. Mist erupts and emerges. Watch with each soundtrack starting around 1:45:50 to 1:46:28 (adjusting to a comparable volume for each) and listen for the following:
35mm Optical Dolby Track
The sound of the lights exploding is loud, with good dynamics. The humming of the Ark is distinct. The sound effects of the mist erupting and emerging are distinct.
1989 Japanese LD
The sound is thin and compressed, with less dynamic volume when the lights explode. There is an added echo as the generator flames out which isn’t on the optical track. The humming is less distinct. The sound effects of the mist erupting and emerging are distinct.
1992 LD
There is an added wind sound that starts right before the generator whir which isn’t on the other tracks. The lights exploding are loud and distinct. No echo on the flame out. The sound of the mist emerging is muted.
2002 blu-ray
The wind sound is there with less volume. The lights exploding have more bass, but aren’t as dynamic. No echo on the flame out. The music has a distinct echo added, which is very pronounced in the surround channels. The humming is much lower in volume. The sound of the mist emerging is muted.
Comparing the optical and blu-ray directly you can really hear the differences. The dynamics of the optical mix are much more dramatic.