ΔE 6.9, close: similar, with a visible difference side by side. Necrotic Flesh is a little darker than Medium Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Necrotic Flesh is a little darker than Medium Green.
The same difference applies the other way round: Medium Green is a little lighter.
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 Medium Green on the colour wheel See Necrotic Flesh on the colour wheel
All matches: Medium Green equivalents · Necrotic Flesh equivalents