Hmmmm. Says PSA: "The exception, however, is that this Tiffany set features gloss-covered fronts with a white cardstock reverse. Cal Ripken, Jr. (#9), Roger Clemens (#26), Mark McGwire (#197), Nolan Ryan (#225), and Barry Bonds (#426) anchor the set. Rookie cards in the series include Robin Ventura (#65), Gary Sheffield (#142), Ken Griffey, Jr. (#220), John Smoltz (#266), and Sandy Alomar, Jr. (#454). This Bowman issue was available solely as a factory set with an estimated 6,000 sets created."
So the difference is that there are "only" about 6000 Tiffany cards.
Well on that point anyway we're on the same page. It doesn't make sense to me either. But then many things in this day and age don't.