ΔE 9.9, close: similar, with a visible difference side by side. Gray FS26440 is a little lighter, more muted, cooler than Mid Imperial Khaki.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Gray FS26440 is a little lighter, more muted, cooler than Mid Imperial Khaki.
The same difference applies the other way round: Mid Imperial Khaki is a little darker, more saturated, 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 Mid Imperial Khaki on the colour wheel See Gray FS26440 on the colour wheel
All matches: Mid Imperial Khaki equivalents · Gray FS26440 equivalents