Beige vs Cosmic Dust

How close are they?

ΔE 16.0, loose: different enough that you should pick on purpose. Cosmic Dust is a little lighter, much more saturated, cooler than Beige.

Can I use Cosmic Dust instead of Beige?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Cosmic Dust is a little lighter, much more saturated, cooler than Beige.

Can I use Beige instead of Cosmic Dust?

The same difference applies the other way round: Beige is a little darker, much more muted, warmer.

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.