ΔE 10.6, fair: the same colour family, but not a straight swap. Extra Dark Green is more saturated than Black Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Extra Dark Green is more saturated than Black Brown.
The same difference applies the other way round: Black Brown is 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.
See Black Brown on the colour wheel See Extra Dark Green on the colour wheel
All matches: Black Brown equivalents · Extra Dark Green equivalents