Question #15 at the Handwriting FAQ at www.abletfactory.com
"What is the location of the User Dictionary and how do I back it up?"
Moving to another Tablet will include a couple of other steps because the file will change. However, just remember the filenames and locations and you can successully xfer the data. Remember these files are located based on User Accounts.
Grammars are affected by the host system, microphone, training etc. I'd set up Test accounts on both systems to determine what variations exist before I migrated my production data.
Good luck, hope this helps.