Day,
I wanted to get me the Galaxy Tab S4 & with his buddy us the Galaxy Skin on it, but Währe the question if you can unlock this several times on a device, as on Ebay & Co. So many offers to buy this skin are so opens up that you can earn it several times.
So your poll is stupid. I suppose that should be the topics.
Next time, please better read through what you define in the question.
To your question: per S4 or Note 9, there's only one Galaxy Skin.
Trust me that is so.