ΔE 16.6, loose: different enough that you should pick on purpose. Dark Flesh Tone is a little lighter, much more saturated, warmer than Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Dark Flesh Tone is a little lighter, much more saturated, warmer than Brown.
The same difference applies the other way round: Brown is a little darker, much more muted, 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 Brown on the colour wheel See Dark Flesh Tone on the colour wheel
All matches: Brown equivalents · Dark Flesh Tone equivalents