Registry using different Rookie Card designations for same player for different sets?
Just looking for information on how the Set Registry determines rookie cards. Here are two examples of what I mean.
In the PSA Registry set "Rookie of the Year (1948-Present) Autographs" the following are the rookie cards designated:
1991 STADIUM CLUB JEFF BAGWELL
1992 BOWMAN MIKE PIAZZA
But in the PSA Registry set "Set Checklist: Hall of Fame Players - Post War Rookies Autographs" we see the following
1991 ULTRA UPDATE JEFF BAGWELL
1992 FLEER UPDATE MIKE PIAZZA
I would think that if PSA has designated a certain card as a "rookie card" then that it should be the same throughout all of their "rookie" sets
am I missing something?