ΔE 8.9, close: similar, with a visible difference side by side. Light Imperial Khaki is a little lighter, more muted than Olive Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Light Imperial Khaki is a little lighter, more muted than Olive Green.
The same difference applies the other way round: Olive Green is a little darker, more saturated.
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 Olive Green on the colour wheel See Light Imperial Khaki on the colour wheel
All matches: Olive Green equivalents · Light Imperial Khaki equivalents