Thanks for the answer. But then it is possible to later transfer the data between the devices?
Yes, The easiest way to do so would be using the built in Codebook Sync Mechanism to sync your encrypted Codebook data to your personal cloud storage (Google Drive or Dropbox) from your old iPhone, then setup your new Android device using the same Codebook master password as you’re using on your iPhone copy of Codebook and sync it with the same personal cloud storage.
Let me know if you’re able to get your data synced over and if there’s anything else I can do to assist.