Board Thread:Questions and Answers/@comment-26855094-20150923201146/@comment-24956068-20150923203246

Unfortunately, yes. All currency data between Android and iOS cannot be transferred (perhaps due to security issues and different systems between Google Play and App Store itself)

I never tried this on myself, but my friend was moved from Android to iOS and she didn't lose any cookies, pets, and treasures, ingredients. Even levels! So, before you move, you better spend all coins, crystals, magic powders, or any remaining consumables before you move to iPad - use them for things that didn't lose!