Thanks for the information! The card design/layout is really similar to the pink-border 3D variants, so I think you’re right that they’re probably part of the same set. It’s all kind of remiscent of the green-border holo cards, which are also four in number and missing a set number (which I also presume to mean they were like the secret rares of the set). I’ll have to change up the order of the sets in my article with this new information. Thanks again for the insights! 
(And the pictures!)
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