ΔE 31.5, loose: different enough that you should pick on purpose. Warm Brown is noticeably darker, much more muted, cooler than Warrior Skin.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 32). Warm Brown is noticeably darker, much more muted, cooler than Warrior Skin.
The same difference applies the other way round: Warrior Skin is noticeably lighter, much more saturated, 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 Warrior Skin on the colour wheel See Warm Brown on the colour wheel
All matches: Warrior Skin equivalents · Warm Brown equivalents