What determines if a release belongs to a release group or not?

So, I own a few blues compilations that were released only in Argentina, but many of them seem to just be licensed reissues of previous albums by these artists. Similarly, there’s at least one bootleg live album by Alice in Chains of their Palladium 1992 show.

These releases share the same tracklist with other releases, same recordings, but their release title, cover art, year of release, label, etc. differ. Should they be left under their own release group, or be merged with the release group with the exact same tracklist?

To give you an example:

has the same tracklist as

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Have you read Style/Release Group? The given examples should clearly share the same release group.