You can 'link' your accounts in vPanel. If the system doesn't link them automatically, submit a ticket and request it. In the top center, next to your name and the logout button, there's a dropdown selector. If your accounts are linked, you can switch between 'vpanels' using that selector. My Express and Residential accounts are linked, so I can log in with either set of username/password (for vPanel), and switch over to the other one.