Onyx Skin vs Red Grey

How close are they?

ΔE 11.9, fair: the same colour family, but not a straight swap. Red Grey is noticeably lighter, cooler than Onyx Skin.

Can I use Red Grey instead of Onyx Skin?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Red Grey is noticeably lighter, cooler than Onyx Skin.

Can I use Onyx Skin instead of Red Grey?

The same difference applies the other way round: Onyx Skin is noticeably darker, 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.