ΔE 8.1, close: similar, with a visible difference side by side. Middle Stone is a little darker, cooler than Ocher Khaki.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Middle Stone is a little darker, cooler than Ocher Khaki.
The same difference applies the other way round: Ocher Khaki 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 Ocher Khaki on the colour wheel See Middle Stone on the colour wheel
All matches: Ocher Khaki equivalents · Middle Stone equivalents