ΔE 16.1, loose: different enough that you should pick on purpose. Bestial Brown is much more saturated, warmer than Umberroot.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Bestial Brown is much more saturated, warmer than Umberroot.
The same difference applies the other way round: Umberroot is 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 Umberroot on the colour wheel See Bestial Brown on the colour wheel
All matches: Umberroot equivalents · Bestial Brown equivalents