I just took a look at your WRL account but i’m not seeing any logbooks listed. When your in the QRZ or LOTW setup via the ‘Integrations’ page, you’ll need to select a WRL logbook from the dropdown inside the setup popup so it knows which logbook to import or export from/to.
You can import from both logbooks, you would just need to link one from the dropdown and then do the import and then unlink the first logbook and add the second logbook then do the import. I hope that makes sense.