They were different companies until Carls', Jr. bought Hardee's in 1997 (I think). Carl's, Jr. kept the Hardee's name in the markets where it was already established. But they made the logos pert near the same.
By my count looks like we got three Super Bowl rematches on the NFL schedule for today of which should make for a exciting day of football action. (Minnesotans are still sore about Super Bowl IV defeat even what many of them weren't even in condition of life at the time.)