ΔE 10.4, fair: the same colour family, but not a straight swap. Beasty Brown is a little darker, more saturated than Light Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Beasty Brown is a little darker, more saturated than Light Brown.
The same difference applies the other way round: Light Brown is a little lighter, more muted.
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 Light Brown on the colour wheel See Beasty Brown on the colour wheel
All matches: Light Brown equivalents · Beasty Brown equivalents