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Rhett YeakleyMike, thanks for the information. Since initially posting I have found out that there were 2 different printings for the 50 Topps cards in this set. All 50 cards are the same in both sets. My set is the second (or later) printing of the set.
Apparently the later version of the set produced essentially used regular Topps cards (as they have one * and those with stats have 1973 listed, as opposed to 1972). However the 6 cards that were different from their regular Topps counterparts are produced in the "Pro-Draft" version but have only one asterisk on back.
What I have heard is that the later version is several times tougher than the regular Pro Draft set, which really doesn't mean anything on the 44 cards that are the same as regular Topps, but the 6 "different front" cards in this version are tougher than their regular Pro-Draft versions.
-Rhett