hello David,
you need a reader to read the broken screen. You enter this data through the same reader into the new one screen. The condition is that you have a working TrueDepth tape that controls the entire TrueTone process. A working Face.ID is not required to run TrueTone.
If you don't have a reader (it's quite expensive), go to the nearest repair shop with a broken and new screen. Ask for data transfer - it certainly won't cost you much.
* regards,