there are 2 options: - use GAE datastore admin to copy data from application A to application B. select only the auth tables, press a button, take a nap, and when you awaken it will be done. - use the GAE bulkloader to do the work. you then have to write the transforms and preserving IDs is a PITA. if you choose to torture yourself with this route let me know and i'll share some tricks with you.
cfh