ΔE 31.5, loose: different enough that you should pick on purpose. Necrosis Green Wash is a little lighter, much more muted, warmer than Kroak Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 31). Necrosis Green Wash is a little lighter, much more muted, warmer than Kroak Green.
The same difference applies the other way round: Kroak Green is a little darker, much more saturated, 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 Kroak Green on the colour wheel See Necrosis Green Wash on the colour wheel
All matches: Kroak Green equivalents · Necrosis Green Wash equivalents