On Die Hard, it's mainly guess work. The 1st LD had the presumable 35mm Dolby Stereo mix with different effects and overall different general mixing. This is the same track that is on the THX LD as the digital track and the ac3 2.0 found on the later DVDs. (The first one was a direct LD port, and the later SE 5 star ones are just reworking of those same transfers. I'm pretty sure the 1st and 2nd film BDs also use this same general master, but heavily modified again)

But as far as if the original untouched 70mm version was released, who knows. Presumably the LD 5.1 in both Dolby and DTS versions is this, as would be the DVD iterations as they used the exact same tracks and video masters.

I don't know about the Drac/Frankenstein tracks PDB, as I've never been able to sample the LD versions of any of them. But, from my research they should be largely identical to the VHS versions, save for the Discovision releases which used nitrate materials and sometimes were able to pull different audio masters.