ΔE 9.9, close: similar, with a visible difference side by side. Burnt Red is a little lighter, cooler than Royal Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Burnt Red is a little lighter, cooler than Royal Brown.
The same difference applies the other way round: Royal Brown 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 Royal Brown on the colour wheel See Burnt Red on the colour wheel
All matches: Royal Brown equivalents · Burnt Red equivalents