Bind guest account to gamecenter

I have been playing this for the last 4-5 months on my old Iphone 4s and had never signed into gamecenter although I did do the facebook connect. Earlier today I got a new Iphone 6s. Is there any way to connect the Iphone 4s account to gamecenter or have it overwrite it? My iphone 4s save is still there and is lvl 63 but as soon as I try to login to gamecenter it starts a new game. The same thing happens on my Iphone 6s. Any help and was the the right place to ask for assistance?
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