The original mono or stereo tracks require edits to be in sync with the BD, + they require the center channel of the 5.1 to keep the sync double checked, as some LD scenes have additional frames but the audio is untouched.
One wish indeed they materialise on 4K, with both the mono and stereo original tracks included, but one doubt it since this is Warner. You’ll get the exact same tracks as before. Check out the Eastwood thread on the other forum for more information.