Sapir-Worf and its ilk (if we don't have the language/concept, we can't perceive the difference/thing) are widely disproven and debunked, and don't even pass the smell test (learning new concepts and perceiving new things would be impossible). That kind of thinking is so tedious and decades out of date with modern cognitive science, neuroscience, psychology, etc.

Not everything you listed is the same.

> Is "pink" a different colour than (light) red?

No, it's a different word for it.

> Where does "white" end and "grey" begin?

When any amount of black is added to white.

> Where does "grey" end and "black" begin?

When the color is 100% black.

White and black are not the same as red, green, or blue. Tinting or shading a color with white or black does not change the color, it lightens or darkens it. That's not the same for RGB. Combining those results in other colors, regardless if a culture has a specific name for it.