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Don't take me for granted though, Steam installs its files under steamapps\common\ whereas Uplay might not attempt to install the DLC in the same location. EDIT: Not even to same APP-ID apparently.
If I were you, I'd ask on the game's own forums,
http://steamcommunity.com/discussions/#games/
https://www.reddit.com/r/Steam/comments/42ptum/bought_an_ubisoft_game_on_steam_but_dlc_for_uplay/
Although, on that reddit chain, OP did get a CD-key that applies to the Steam Store bought copy from Ubisoft once contacted. I wouldn't rely on that thought though if I were you.