The Jehoiachin thingie isn't a KJV error; it's just to prove God gave His perfect word to imperfect men who sometimes goofed, as we all do on occasion.
Remember, Kings & Chronicles are historic narratives written my men, but selected by God to become Scripture. A close reading of each one shows there was at least one other version of Kings & one other version of Chronicles that didn't make Scripture.
I believe, however, that if ine puts together the events in Kings & Chronicles, one has a more accurate picture of the actual events. Such is the case with the bronze basin in the Temple. It was observed about 2/3 full, (2K baths)but it had a known capacity of 3K baths.
Now, where one says Jehoiachin reigned 3 months & the other says 3 mos, 10 days, the writer of Chronicles may have been in the king's court, while the writer of Kings had only secondhand info. However, this does NOT cover a 10-year gap. I believe the writer of Kings made a typo. After all, the Hebrew word for eight is sh'mownah, and for eighteen is sh'mownah'asar, the "asar" meaning "teen", Asar, according to a rabbi I know, is always a prefix or suffix, never a stand-alone word. After all, it's easy for US to make a typo between eight-eighteen.