ΔE 11.1, fair: the same colour family, but not a straight swap. Basilisk Red is a little darker, more saturated, cooler than Umber Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Basilisk Red is a little darker, more saturated, cooler than Umber Brown.
The same difference applies the other way round: Umber Brown is a little lighter, more muted, 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 Umber Brown on the colour wheel See Basilisk Red on the colour wheel
All matches: Umber Brown equivalents · Basilisk Red equivalents