Another Proof Card That Varies From the Actual Card Produced

I already found that I had a few proof cards that weren't exactly the same as the card produced by Kellogg's.  Today I noticed that one of my favorite cards, Lou Gehrig's All-Time Greats card, varies slightly from the product issued. 

The proof card listed is dated 1972, but it is most likely a 1970 Rold Gold proof card.  Why do I think that?  The first card shown below could be either a 1970 Rold Gold or 1972 Kellogg's.  Notice where the signature is located on the card.   The signature is in the same place on both cards. 

The proof card has the signature in a different place.  The signature doesn't look that good on the proof card so they lowered it to make is more visible. 

I am still looking to find more proof cards from the Benanti Collection.  If you know how I can do that please let me know.