In the NFL, has any team won the National Championship and the Super Bowl in the same year?
I don't think there is a team that has won the national championship and the super bowl in the same year. You can visit http://www.superbowlhistory.net/ to see the list of NFL winners.
Not sure what your question is asking. The National Championship is for Division 1 colleges. The Super Bowl is for professional teams. No one team could literally win both.