2 Game Center profiles on 1 apple id when I only want one?

I play Clash of Clans on my iPhone, and I got an iPad mini and I was hoping to sort of merge the game and play the same account, the same village, with 2 devices, I read this was possible but once I tried, both of the devices had to be on the same game center profile, well the problem is they're on two separate profiles on 1 apple id, how can I get them to use the same one?

Log in with the same apple ID and password, than you have one account. Then use that account to play clash of clans. I do not know how it is possible to have 2 game center profiles on one gamecenter account.

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