ΔE 17.0, loose: different enough that you should pick on purpose. Bestial Brown is a little lighter, more saturated, warmer than Doombull Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Bestial Brown is a little lighter, more saturated, warmer than Doombull Brown.
The same difference applies the other way round: Doombull Brown is a little darker, 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 Doombull Brown on the colour wheel See Bestial Brown on the colour wheel
All matches: Doombull Brown equivalents · Bestial Brown equivalents