ΔE 9.6, close: similar, with a visible difference side by side. Terran Khaki is more muted, warmer than Necrotic Flesh.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Terran Khaki is more muted, warmer than Necrotic Flesh.
The same difference applies the other way round: Necrotic Flesh is 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 Necrotic Flesh on the colour wheel See Terran Khaki on the colour wheel
All matches: Necrotic Flesh equivalents · Terran Khaki equivalents