There are exceptions though, there are cases where keys with different region restrictions can be activated.
Example: WW and ROW keys can be activated both on the same account.
And when i tried to redeem To The Moon from Humble it actually added it to my account again even though i already owned the game.
So it is possible.
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If the key is for a slightly different version than what you already have, then yes (for example, you own the WW version and you get a key for the ROW version). If it's for the exact same thing as you already own, then no, as far as I know.
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Sometimes yes, but most likely not. As others said, WW and ROW may both activate. Then you may get double games of which the other is a Windows version and the other is Mac. Also, in some cases games have two versions, an old one and a new one. That happened to me with UFO: Afterlight.
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I sounds a little bit confusing from a title but here is explantion: Can i redeem a key from already owned game?!
Can i actually waste key for game which i already have?
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