Baharum (verse 33) is spelled “Bahurim” in 2 Sam 23.31. These are clearly variant forms of the same name and may be harmonized as in Revised English Bible and many other modern versions.
Quoted with permission from Omanson, Roger L. and Ellington, John E. A Handbook on 1-2 Chronicles, Volume 1. (UBS Helps for Translators). Miami: UBS, 2014. For this and other handbooks for translators see here .