Krieg Khaki vs Sand Grey

How close are they?

ΔE 17.7, loose: different enough that you should pick on purpose. Sand Grey is noticeably lighter, more muted, warmer than Krieg Khaki.

Can I use Sand Grey instead of Krieg Khaki?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Sand Grey is noticeably lighter, more muted, warmer than Krieg Khaki.

Can I use Krieg Khaki instead of Sand Grey?

The same difference applies the other way round: Krieg Khaki is noticeably darker, more saturated, cooler.

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.