It's funny that you mention the clasp---I just received my Gaby BB tourterelle with GHW and it also looks like it has a chunkier clasp than my SHW PM Gabrielle, though in actuality they probably are the same. It may be the way the light hits it. A question for my SA, I guess.
However, as to subtle changes, after Ramesh left, and even before Knightly took over, the Danse was changed to have different piping---again, a small change, but a change nevertheless. This accounted for a price differential for bags that were on sale (Ramesh era) and those that weren't (after he left).
In any event, I still love this Gaby (it's gorgeous!) and my only question now is whether I should consider it in the PM size, instead. I had never tried on either size previously...