Yeah, I only ever use chestnut, and perhaps flaxen chestnut or liver chestnut depending on the shade.
It's no different than using blood bay, bay or dark bay to describe a black horse with agouti (although dark bay is now known to be almost exclusively brown).
Same as using "buttermilk" or "claybank" to describe buckskin and dun. Genetically, all the shades are the same, they just come up with descriptive words based on shade.
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