The only way a GG/Steam purchased title carries over would be if the GG purchased game required Steam for activation it will say that on the information page at GG.Now it does not make it clear that a GG game that was activated seprate from Steam can not use Steam DLC which it should.
It really does not matter that much as the DLC prices tend to be about the same anyway so you are not losing out buying a game on GG and having to use GG for the DLC.Both sites have sales so you just wait for a DLC to go on sale on GG.You can always scan Steam to spot when GG DLC is cheaper for your GG game.
I just looked and the prices are the same for CCII DLC on both Steam and GG so you did not lose out buying CCII from GG unless you really must have all of your games from Steam.
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