ΔE 9.5, close: similar, with a visible difference side by side. Burnt Red is a little darker, more muted, cooler than Umber Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Burnt Red is a little darker, more muted, cooler than Umber Brown.
The same difference applies the other way round: Umber Brown is a little lighter, more saturated, 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 Burnt Red on the colour wheel
All matches: Umber Brown equivalents · Burnt Red equivalents