Thread:Project:Support desk/Should I use CentralAuth or shared tables?/reply (20)

No, it wouldn't work. You can use ReassignEdits extension to reassign edits from an old user to a new one. It's also possible to use Renameuser for one wiki only. For the other wikis, you would still have to use ReassignEdits to reassign the user's edits on the other wikis, too. Therefore, creating a new account and using ReassignEdits extension is probably easier.