ΔE 9.4, close: similar, with a visible difference side by side. Interior Grey Green is a little lighter than Dark Imperial Khaki.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Interior Grey Green is a little lighter than Dark Imperial Khaki.
The same difference applies the other way round: Dark Imperial Khaki is a little darker.
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 Dark Imperial Khaki on the colour wheel See Interior Grey Green on the colour wheel
All matches: Dark Imperial Khaki equivalents · Interior Grey Green equivalents