ΔE 8.3, close: similar, with a visible difference side by side. Mid Battle Dress is a little darker, cooler than RAF Dark Earth.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Mid Battle Dress is a little darker, cooler than RAF Dark Earth.
The same difference applies the other way round: RAF Dark Earth is a little lighter, 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 RAF Dark Earth on the colour wheel See Mid Battle Dress on the colour wheel
All matches: RAF Dark Earth equivalents · Mid Battle Dress equivalents