ΔE 6.4, close: similar, with a visible difference side by side. Rust is a little darker, cooler than Dark Flesh.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Rust is a little darker, cooler than Dark Flesh.
The same difference applies the other way round: Dark Flesh 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 Dark Flesh on the colour wheel See Rust on the colour wheel
All matches: Dark Flesh equivalents · Rust equivalents