Doran's Item versions of Normal and Showdown

When I check the list of items in League of Legends under "Item Sets", and search "Doran's", I get two versions of each of the Doran's items (Doran's Blade, Doran's Ring and Doran's Shield), the normal and the "Showdown" version.
What is the difference between these two versions of items?
Best Answer
In addition to Jake's answer, if you actually make the item set and aren't in the place you have the set for, it won't show up. Tear of the Goddess (http://gameinfo.na.leagueoflegends.com/en/game-info/items/) for example has a Crystal Scar and "normal" version. If you just put "normal" and play Crystal scar the Item Set will show but the Tear will not. General rule there but applies to the Q.
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How much does Dorans shield sell for?
RecipeCostSellID4501801054Doran - A warrior is born - Episodio 2 - Lo Sport come stile di vita
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