Please see below:
Scenario One: Synchronize game data between multiple devices of the SAME platform (for example, Android or iOS devices)
1) If you have a Guest account, the 1st step is to connect your Guest account to Facebook on your original device. The 2nd step is to login with that Facebook account on your new device and you will find your game data.
2) If your account is Facebook or Game Center or Google account, just log in your Facebook/GameCenter/Google account on your new device. The data will be automatically synchronized.
Scenario Two: synchronize game data between DIFFERENT platform devices (for example, from Android to iOS)
Currently the game data, no matter if it is saved in Facebook, Game Center, Google or Guest account, cannot be synchronized between different platforms.