Daniel 3 belongs to the reign of Nebuchadnezzar.
Daniel 6 takes place under a different power and puts Daniel himself in the foreground.
Despite this historical difference, the two accounts share many elements.
In Daniel 3, Daniel's three companions are threatened because they refuse a religious practice.
In Daniel 6, Daniel is threatened because he maintains a religious practice.
The first account therefore concerns the obligation to perform an act forbidden by faithfulness to God.
The second concerns the prohibition of performing an act required by that same faithfulness.
The two main forms of religious coercion are thus represented.