ΔE 12.5, fair: the same colour family, but not a straight swap. Chaotic Red is a little lighter, cooler than Burnt Umber.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Chaotic Red is a little lighter, cooler than Burnt Umber.
The same difference applies the other way round: Burnt Umber is a little darker, 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 Burnt Umber on the colour wheel See Chaotic Red on the colour wheel
All matches: Burnt Umber equivalents · Chaotic Red equivalents