ΔE 8.8, close: similar, with a visible difference side by side. Khaki is a little lighter, more saturated than IDF Sand Grey '73.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Khaki is a little lighter, more saturated than IDF Sand Grey '73.
The same difference applies the other way round: IDF Sand Grey '73 is a little darker, more muted.
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 IDF Sand Grey '73 on the colour wheel See Khaki on the colour wheel
All matches: IDF Sand Grey '73 equivalents · Khaki equivalents