User blog comment:Knj00/Device Transfer/@comment-13451980-20131006081900/@comment-5838460-20131230044545

I happened to test this accidentally (I forgot to download the app on the new device before the transfer) and I didn't lose my progress.

It is okay to transfer the data from the old device to the new device first, and then download the app in the new device. You still have the data from the old device.