Auto fill credit card billing name and address information for civicrm event registrant - webform-civicrm integration
(Clarified that information needed was billing name and address information, not credit card details)

This information can be automatically filled in if the registrant is logged into the website (and has a valid Civi record attached to their website account), or by sending invitation emails with a checksum token inside.

Unfortunately I don't think there is a "same as above" checkbox on the event registration form.