If you have several editions (releases) in the same release group, you can merge the recordings without ultra extensive research, with MASS MERGE RECORDINGS.
But after that, check your open merge edits for mismatches, because it regularly happens that some recordings are wrongly attached to mismatching tracks, in existing albums.
But otherwise, merging, just based on AcoustID and duration, may not be enough research.
There is a very cool script that shows you in what other releases, recordings also appear: Inline all recording’s tracks on releases.
There are also INLINE STUFF (shows AcoustID themselves) and Compare AcoustIDs easier! (shows AcoustID icons only), that can display AcoustID, directly in release page.
And finally: Merge recordings from acoustID page.