Chestnut or something else?

My chestnut/sorrel gelding has a white spot too. Idk what they are but your guy is definitely a sorrel/chestnut

Yh I would say he was a chestnut my chestnut has way more white hair and he's classed as a chest nut lol you should see him molting theres white hair every were
One question when he gets his summer coat has he got less white hair?

My former QH gelding was chestnut/sorrel and he had little sprinklings of white hairs through out his body. I had searched it once and read an article that called it "roaning" not to be confused with "roan". Just random white hairs sprinkled around....on his flanks, neck, throat latch area, hips, his back.

Spot is saddle issue at some point. Pretty boy by the way...sorrels are one of my favorites.

They are the same thing, only in "western" terms, a sorrel is a chestnut horse & a chesnut is what would be termed a liver chesnut in "english" terms lol.
Kind of like how "western" folks call a canter a lope.