Hi Cleo,
I will do "switch account". They are imported by HRimport therefore useridnumber is key identification so switch them 🙂
E.g. first account has useridnumber as '111' and new one has '222'. Rename '222' to '222_backup' and than rename first account '111' to '222'. Initialize HRimport manualny if you have that options (with generate src data) or wait till next scheduled run. It should automaticaly swap all fields (username, fullname etc). New second account '222_backup' can be deleted or renamed to '111'…