US Interior Yellow Green vs Underhive Ash

How close are they?

ΔE 14.3, fair: the same colour family, but not a straight swap. Underhive Ash is noticeably lighter, more muted than US Interior Yellow Green.

Can I use Underhive Ash instead of US Interior Yellow Green?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Underhive Ash is noticeably lighter, more muted than US Interior Yellow Green.

Can I use US Interior Yellow Green instead of Underhive Ash?

The same difference applies the other way round: US Interior Yellow Green is noticeably darker, more saturated.

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.