On the 1991 Topps Bazooka cards, there is a "not so subtle variation" on the card backs. The (base cards) show the full word "Bazooka" Spelled out, with pink, and blue letters, and pink, white, and blue background. The variation, only has the pink background, and letters "B z o k a". The blue background and letters "a o k" are missing. I am only showing the Rickey Henderson card for reference. But, 20 of the 22 cards, in the set listed in the database, show the variation. Should these be divided into 2 separate sets?