That would get my vote, too.
Where does that come from, anyway? Only Discogs? Neither the cover, nor the Bowers-Wilkins page has it.
Some what arguable if it was a single session recorded at a studio, no overdubs, etc. We don’t know whether this is the case here, so I’d simply go with what’s on the cover … and remove „live“.
Definitely a new release group, because there are no shared recordings, these are new arrangements, etc. I don’t think we have a fitting RG-RG relationship, though.