Board Thread:Questions and Answers/@comment-27023030-20151029065620/@comment-24577221-20151030053143

If you use the same log-in account on both devices, by Facebook or Apple store (or Google Play for Android devices), you should find that you're playing the same game. The game state is stored on the BBB server, not on the device; the log-in ID identifies you to the server, and the device then downloads the game state from the server.

Or at least that's how it works for the original MSM on both device types, and for MSM:DoF for Android. I'd be surprised if it was different for MSM:DoF on Apple devices.