ΔE 17.7, loose: different enough that you should pick on purpose. Tan Earth is noticeably lighter, much more muted, warmer than Brutal Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Tan Earth is noticeably lighter, much more muted, warmer than Brutal Brown.
The same difference applies the other way round: Brutal Brown is noticeably darker, 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 Brutal Brown on the colour wheel See Tan Earth on the colour wheel
All matches: Brutal Brown equivalents · Tan Earth equivalents