Hmm, so, I have this LP: https://www.discogs.com/release/11967617-The-Rob-Franken-Electrification-Wolfgang-Schl%C3%BCter-Dont-Stop

It's not in musicbrainz yet, so I want to add it. There is however the 3CD release with all the volumes in the series that this LP belongs to, so if the recordings are the same, I could add the LP release and re-use the existing recordings. However, looking at the track list for the 3CD release, the tracks that are also on the LP have different lengths (few seconds of). This doesn't mean they are different recordings per se, which they aren't I think (because these are old recordings that have been found on a tape and then published by 678 records).

Should I just re-use the existing recordings, or add new ones with the times as listed on discogs (which are copied from the LP sleeve)?