Question: how to transfer gamecenter data to another apple id?
Answer: Login your Game Center with your Apple ID. ... 
Open the game and go to in-game settings.
Tap "Bind Acct." to bind the game to Game Center.
Now, take your target device and log into the same Game Center ID.
Download the game from Apple Store.
Start the game and confirm that you want to load your profile with your Game Center.