ΔE 8.4, close: similar, with a visible difference side by side. Desert Tan is a little darker, more muted than IDF Sand Grey '73.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Desert Tan is a little darker, more muted than IDF Sand Grey '73.
The same difference applies the other way round: IDF Sand Grey '73 is a little lighter, 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 IDF Sand Grey '73 on the colour wheel See Desert Tan on the colour wheel
All matches: IDF Sand Grey '73 equivalents · Desert Tan equivalents