@OP It's really easy to get your old account on your new device. Make sure you've synced your SW account to either HIVE and/or Google/Facebook. Afterwards, start up the game on your new device. Play through the entire tutorial. You'll need to go through it before you're able to start doing stuff on your own.
Once the tutorial is finished, and you have full control back, press the icon beside your name in the top left corner of the screen. In the account section, you should have the option to sync your old account back using either HIVE or Google/Facebook. Press the appropriate options, at which point it will let you know that any progress on the new account will be lost. Press okay or whatever it says, and after a quick automatic restart, everything should be back.
I've synced my account across multiple devices with no trouble at all. A lot of people don't know that you have to finish the tutorial first before you can sync (stupid I know).