It is. All the old whiskey with the Van Winkle and Weller name is either changing over to new batches, or disappearing and being replaced by new names. Not that much old whiskey around anymore, corporate buyouts, distilleries are having to come up with new formulas to feed old labels or just come up with new formulas and replace old labels. That's what's happened to, and still happening with any familiar old Weller/Van Winkle whiskey, lots of other old familiars too.
Look at the guy here who ordered the Evan Williams 1783 10 year old bourbon, I believe partially from reading my review, and got stuck with Evan Williams 1783, Old No. 10, which turned out to be nine years old, and probably a lot different from the bottle in my cabinet right now. It's happening all over the place.