ΔE 8.9, close: similar, with a visible difference side by side. Medium Brown is a little darker, more saturated than Scorched Earth.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Medium Brown is a little darker, more saturated than Scorched Earth.
The same difference applies the other way round: Scorched Earth is a little lighter, more muted.
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 Scorched Earth on the colour wheel See Medium Brown on the colour wheel
All matches: Scorched Earth equivalents · Medium Brown equivalents