The answer lies in the Release Notes. From the 1989 ProCards Triple A set: This set is most easily identified by player stats lines include the 1989 season on the reverse side of the cards.
Meanwhile, the Release Notes for the 1989 ProCards Minor League Team Sets state: This set is most easily identified by player stats lines only include data through the 1988 season. Some teams' player cards also include local sponsorship ads on the reverse side of the card as well.
That said, looking at the two cards in question, it seems we have a case of mistaken scans. I know the user who uploaded them was slowly working his way back through at one point, once it was determined that two distinct sets existed, though I can't speak to where they are on that project. Clearly they updated the Triple A set, as it is accurate. The Minor League Team Sets card has a wrong back scan.
I'll never quit collecting entirely, but I am downsizing. Check out my COMC store and help me thin out what I don't want so I can buy cards that I do want. See something you like? Send me a message on here, and we can knock the price down quite a bit. I'll even take a bit of a loss if it means getting you a card you really want.
