I am delighted to discover that Wookieepedia has multiple footnotes re: the colour of Anakin’s hair.

IMO they’re both blond in live-action, though it’s arguable with Anakin – Anakin’s hair looks like a very dark blond to me, and Obi-Wan’s is more of a golden blond. Definitely not the platinum blond and fiery red implied by some fic descriptions, LOL.

Also “blond” no longer looks like a word.