There are 6 copies of the Nabokov card listed on COMC.com. It's listed in the 1995 Signature Rookies Draft Day Signatures set. As I was looking for it on Beckett.com, I searched "Signature Rookies Draft Day" in the Hockey category. A 1996 Signature Rookies Draft Day Autographs set was listed but each player was listed at TBD. Each card had a SN/PR of 4500.
I could not find much about the Roberto Alomar card. I did find a listing for it on eBay that ended in April. I was looking through the feedback of the seller (1bluejaysman) and they sold a Joe Carter card similar to the Alomar. I would have to guess there might be a Jimmy Key card in the set, but I have not seen any.