ΔE 7.2, close: similar, with a visible difference side by side. USA Olive Drab is a little lighter, more saturated than Scorched Earth.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). USA Olive Drab is a little lighter, more saturated than Scorched Earth.
The same difference applies the other way round: Scorched Earth is a little darker, 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 USA Olive Drab on the colour wheel
All matches: Scorched Earth equivalents · USA Olive Drab equivalents