ΔE 7.9, close: similar, with a visible difference side by side. Necrotic Flesh is a little darker, cooler than Ochre.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Necrotic Flesh is a little darker, cooler than Ochre.
The same difference applies the other way round: Ochre is a little lighter, 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 Ochre on the colour wheel See Necrotic Flesh on the colour wheel
All matches: Ochre equivalents · Necrotic Flesh equivalents