Hello @1407 Hearty Welcome to the friendly King Community
I am sorry to say that we cannot transfer our boosters from one device to another!! But, if you have purchased them with real money, you can contact the King Player Relations Team and request to reimburse for the boosters you bought!
Those boosters on your old device won't disappear until you delete the App. So, you can still play the game and use-up all of them in one of those hard to beat levels
Hope this made sense and clarifies! Please post back if you need further assistance!
Thank you for posting in the Community! Have a great week ahead!