Cosmic Dust vs Naples Yellow Hue

How close are they?

ΔE 15.3, loose: different enough that you should pick on purpose. Naples Yellow Hue is a little darker, more muted, warmer than Cosmic Dust.

Can I use Naples Yellow Hue instead of Cosmic Dust?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Naples Yellow Hue is a little darker, more muted, warmer than Cosmic Dust.

Can I use Cosmic Dust instead of Naples Yellow Hue?

The same difference applies the other way round: Cosmic Dust is a little lighter, more saturated, cooler.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.