Same here, 'cause Grif is usually very readily identifiable, he really had his own sound whereas Grossman was more derivative (Trane early, Newk later). Am also chagrined because there is simply no excuse - I own the damn CD!
Well, it's later Griff, the tone is a little "looser" (just a little), and he's not as tightly recorded as usual, so there's more ambient sound surrounding his tone. I confess it was a few bars before I locked onto it.
But just a few.