ΔE 6.5, close: similar, with a visible difference side by side. Dark Rust is a little darker, warmer than Burnt Red.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Dark Rust is a little darker, warmer than Burnt Red.
The same difference applies the other way round: Burnt Red is a little lighter, cooler.
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 Red on the colour wheel See Dark Rust on the colour wheel
All matches: Burnt Red equivalents · Dark Rust equivalents