Mid Mustard Khaki vs Khaki Brown

How close are they?

ΔE 7.5, close: similar, with a visible difference side by side. Khaki Brown is a little darker, more saturated than Mid Mustard Khaki.

Can I use Khaki Brown instead of Mid Mustard Khaki?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Khaki Brown is a little darker, more saturated than Mid Mustard Khaki.

Can I use Mid Mustard Khaki instead of Khaki Brown?

The same difference applies the other way round: Mid Mustard Khaki is a little lighter, 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.