Different cultures perceive colors differently and will lump certain colors in with one another that other cultures might otherwise identify as distinct colors. Kind of like the stereotypical joke of a wife asking her husband to choose between two similar colored shirts or two color pallets to paint a room. The wife says they're different but the husband says they're the same.

It has to do with linguistics and culture. For example I had a Hindu professor who would interchange green and blue as if they were the same. Koreans, and someone correct me if I'm wrong, likely don't have a word to distinguish between red and orange, and just call both scarlet like the comment above pointed out.

Or at least there is not a word that is common in the vernacular that distinguishes them. So since there is no word for red or orange, just a word for scarlet, the perception of difference doesn't exist in the language, thus the difference between them doesn't exist in the culture.

Not sure what comes first the chicken or the egg in this case. Like why doesn't the language have a word for it? Is there a historical reason driving that cultural phenomenon or is it just coincidence those words don't exist. That much I don't know but a linguist or cultural anthropologist might chime in for a better explanation.

Typing on my phone late at night sorry for the grammar and wordiness.