The ninth chapter is the same with 1 Kings 10:1 excepting 2 Chronicles 9:26, which agrees with 1 Kings 4:21, the same with
1 Kings 11:41, only in 2 Chronicles 9:29 it is more largely expressed that the acts of Solomon's reign were written in the book of Nathan the prophet, and in the prophecy of Ahijah the Shilonite, and in the visions of Iddo the seer, against Jeroboam the son of Nebat; or rather "concerning Jeroboam," as the Septuagint and some other versions {b}, in which Iddo is called Joel; and by Theodoret said to be the same that prophesied of Jeroboam and his altar, See Gill on "1Ki 13:1"; the books mentioned are since lost.
{b} leperi Sept. de, Junius &
Tremellias, Piscator.
2 Chronicles 9 Bible Commentary
John Gill’s Exposition of the Bible
{b} le peri Sept. de, Junius & Tremellias, Piscator.