ΔE 15.3, loose: different enough that you should pick on purpose. Brutal Brown is a little darker, much more muted, warmer than Topaz Skin.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Brutal Brown is a little darker, much more muted, warmer than Topaz Skin.
The same difference applies the other way round: Topaz Skin is a little lighter, much 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 Topaz Skin on the colour wheel See Brutal Brown on the colour wheel
All matches: Topaz Skin equivalents · Brutal Brown equivalents