Gobi Brown vs Khaki Grey

How close are they?

ΔE 6.8, close: similar, with a visible difference side by side. Khaki Grey is more muted, warmer than Gobi Brown.

Can I use Khaki Grey instead of Gobi Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Khaki Grey is more muted, warmer than Gobi Brown.

Can I use Gobi Brown instead of Khaki Grey?

The same difference applies the other way round: Gobi Brown is 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.