Charles Ellicott Commentary Jeremiah 52:31

"And it came to pass in the seven and thirtieth year of the captivity of Jehoiachin king of Judah, in the twelfth month, in the five and twentieth day of the month, that Evil-merodach king of Babylon, in the [first] year of his reign, lifted up the head of Jehoiachin king of Judah, and brought him forth out of prison;" — Jeremiah 52:31 (ASV)

In the seven and thirtieth year of the captivity of Jehoiachin ... — The closing narrative is almost identical with that of 2 Kings 25:27. The only differences are:

1. That “five and twentieth” stands for “seven and twentieth.”
2. That in Jeremiah 52:34 we have “the king of Babylon” instead of “the king.”
3. That the pleonastic words “until the day of his death” are inserted before “all the days of his life.”

The reader is referred to the notes on that section.

The variations between the two chapters, the most important of which have been noticed in the Notes, are not without importance. Though insignificant in themselves, these variations imply that a consistent belief in the substantial truthfulness of the historical records of the Old Testament is independent of mere verbal accordance in matters of minute detail.