ΔE 12.1, fair: the same colour family, but not a straight swap. Muddy Ground is a little lighter, more saturated than Black.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Muddy Ground is a little lighter, more saturated than Black.
The same difference applies the other way round: 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.
See Black on the colour wheel See Muddy Ground on the colour wheel
All matches: Black equivalents · Muddy Ground equivalents