Regarding the track timings: You can make a new release based on the old one but manually adjust the timings on the Tracklist tab. You can reuse the same recordings even with a 2-3 second difference if the difference is only silence or length of fade-out. See https://musicbrainz.org/doc/Style/Recording#Merging_recordings .
Listening to that IQ album on Tidal, I hear a number of cross-fades between tracks so I’m guessing that’s where the re-indexing came in. That issue was discussed here: Does cross-fade create a new recording or not? and the “consensus” seems to be they should be separate recordings. (I put consensus in quotes because only two editors actively participated in that thread; however, several people “liked” @sibilant’s reply which I take as agreement.)
In that case, you can still base the new release on the old one, and just use the “add a new recording” option on the Recordings tab for the tracks that have changed length.