IDF Sand Grey 1970s-1980s vs Dark Mustard Khaki

How close are they?

ΔE 4.6, very close: most people won’t see a difference side by side. Dark Mustard Khaki is more saturated than IDF Sand Grey 1970s-1980s.

Can I use Dark Mustard Khaki instead of IDF Sand Grey 1970s-1980s?

Yes, for most jobs. Very close match (ΔE 5). Dark Mustard Khaki is more saturated than IDF Sand Grey 1970s-1980s.

Can I use IDF Sand Grey 1970s-1980s instead of Dark Mustard Khaki?

The same difference applies the other way round: IDF Sand Grey 1970s-1980s is 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.