There are very variations to the UV coating placement. Just borders vs. borders and stat area. I don't recall all the different combinations but some are definitely in shorter supply than others.
Like Steve B said, I have found both types in the same box. My sample size was roughly 8 3200/5000ct boxes and a dozen or so wax, jumbo and rack boxes as well as a few factory sets (they are all glow versions in the xmas set). This is just what I picked up when they were discovered/gaining traction two years ago or so. Across the board, I saw fewer non-glow backs than glow, estimate about 30-40% non glow.
One of the rarest varieties I have found is a non-glow back with a yellowish cardstock (when under the UV lamp).
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