Do you have a Full Backup?
If yes.
On your new iPad log in to Apple Store with the same account you used to purchase the original ST3.
Find ST3 - Stage Traxx 3 - install it,
Go to ST3 STORE in settings and hit restore full version, you will not be charged again.
Then go to settings , restore full backup and install your latest full backup, now you are back to normal.
If you don’t have a full backup, you are up shit creek without a paddle, hopefully you have all your backing files somewhere , you need to reinstall them and edit everything you need in to them , this will take a lot of work.
Good luck, always make a full backup and store it on another device preferably at home so you can always get back to normal operation without much effort.
Cheers Damir merry Xmas 🎄