Rotten Yellow vs Cosmic Dust

How close are they?

ΔE 12.4, fair: the same colour family, but not a straight swap. Cosmic Dust is a little lighter, more saturated than Rotten Yellow.

Can I use Cosmic Dust instead of Rotten Yellow?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Cosmic Dust is a little lighter, more saturated than Rotten Yellow.

Can I use Rotten Yellow instead of Cosmic Dust?

The same difference applies the other way round: Rotten Yellow is a little darker, more muted.

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.