ΔE 10.3, fair: the same colour family, but not a straight swap. Mars Black is a little darker, more muted than Blighted Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Mars Black is a little darker, more muted than Blighted Green.
The same difference applies the other way round: Blighted Green is a little lighter, 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.
See Blighted Green on the colour wheel See Mars Black on the colour wheel
All matches: Blighted Green equivalents · Mars Black equivalents