ΔE 9.1, close: similar, with a visible difference side by side. Radiation Glow is more saturated than Dark Flesh.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Radiation Glow is more saturated than Dark Flesh.
The same difference applies the other way round: Dark Flesh is more muted.
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 Dark Flesh on the colour wheel See Radiation Glow on the colour wheel
All matches: Dark Flesh equivalents · Radiation Glow equivalents