ΔE 9.8, close: similar, with a visible difference side by side. Light Imperial Khaki is a little darker than Medium Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Light Imperial Khaki is a little darker than Medium Green.
The same difference applies the other way round: Medium Green is a little lighter.
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 Medium Green on the colour wheel See Light Imperial Khaki on the colour wheel
All matches: Medium Green equivalents · Light Imperial Khaki equivalents