Well, they do take the same sort of environment, however, I would never mix species. Also, the box turtle might bite the tortoise. They are pretty aggressive.
Neither species Is a pack animal. Both are solitary. Neither want or need a roommate.
Is there a particular reason you want to keep something with a box turtle?
Never mix species, and neither tortoises nor box turtles should ever live in pairs.
Other Florida box turtles of the correct sex ratio can cohabitate with a Florida box turtle in a large naturalistic outdoor enclosure. That would be awesome!