I think that last bit answers my question. . .this one is actually available!
Again, don't mean to be a wise-acre, but how different are these things, really? To me these all look to be basically variations on the same thing, maybe worked in slightly different directions, and my head is spinning with this.
According to the GGG website, Grape puff was created with a fast maturing "Bright moments" pheno, so I guess the point of this particular variation is fast finish. Strictly by the numbers, this one is 62.5% JoOG and 37.5% Grape Stomper, but that's misleading, since the true genetic percentages will depend on how the selection was done along the way. In any case, since both the Jo OG and Grape Stomper parents are unstable hybrids, and since this is basically an F3 hybrid of those hybrids, you must have to see some pheno variation here along the Jo/GP spectrum.
By the way, I have no idea what "Jo OG" is, but I must say I like the sound of it ("jOGro OG?").