Contradiction with 2 Chronicles 26:1
While 2 Kings 14:21 states that Azariah, also called Uzziah, was made king by all the people of Judah, 2 Chronicles 26:1 reaffirms this but later introduces additional details about events during his reign that are not in 2 Kings.
2 Chronicles 26:1: Then all the people of Judah took Uzziah, who [was] sixteen years old, and made him king in the room of his father Amaziah. [Uzziah: or, Azariah]