To move both databases with one AirTable account to another account without losing synchronization, begin by exporting data from the original account to secure a backup. Next, set up new databases in the target account mirroring the structure of the originals. Import the exported data into these new databases. Now, recreate the sync tables in the new account, ensuring they are configured to sync correctly with the source tables. Verify all sync settings, including field mappings and relationships. Now before the final transition, conduct thorough testing to guarantee data integrity. Hope this will help but if not, reach out to AirTable support for assistance.