ΔE 11.9, fair: the same colour family, but not a straight swap. Black Green is more muted, cooler than Tainted Garden.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Black Green is more muted, cooler than Tainted Garden.
The same difference applies the other way round: Tainted Garden is more saturated, 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.
See Tainted Garden on the colour wheel See Black Green on the colour wheel
All matches: Tainted Garden equivalents · Black Green equivalents