To carry your whole library and playlists to a new device, use a backup, not one-by-one sharing.

 

Make a backup (Settings > Backup on iPhone, iPad, and Android; File > Backup on Mac and Windows), save it to a cloud service or email it to yourself, then open that file with iReal Pro on the new device to restore everything.

 

For more, see Share a song or playlist on the iReal Pro website.