I don't really like that color either, but it's rare! And different. Gibson doesn't do a lot of green guitars or basses, period. In my harem I have one green bass from them and that is the Epi neck thru LP prototype that sounds a bit like a Ric.
Good question what would makes this Custom Shop other than the fin. If it were a Les Paul you might assume that the neck tongue/body-contact is better as it is on the Custom Shop Lp guitars as opposed to the Gibson USA one, but with a TBird I wonder (just like I do with Firebirds) what the Custom Shop could do with the structure that is "better". And without structural improvement, all that is left to customize is a better fret job (nowadays they PLEK), a non-standard fin and perhaps a choice of better-grade wood. The hardware certainly looks identical to a rank and file TBird on this specimen.