ΔE 6.5, close: similar, with a visible difference side by side. Olive Brown is a little lighter than Burnt Brown Red.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Olive Brown is a little lighter than Burnt Brown Red.
The same difference applies the other way round: Burnt Brown Red is a little darker.
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 Brown Red on the colour wheel See Olive Brown on the colour wheel
All matches: Burnt Brown Red equivalents · Olive Brown equivalents