Grim Black vs Mahogany

How close are they?

ΔE 14.6, fair: the same colour family, but not a straight swap. Mahogany is a little lighter, more saturated than Grim Black.

Can I use Mahogany instead of Grim Black?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Mahogany is a little lighter, more saturated than Grim Black.

Can I use Grim Black instead of Mahogany?

The same difference applies the other way round: Grim Black 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.