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