Mid Mustard Khaki vs Gobi Brown

How close are they?

ΔE 17.4, loose: different enough that you should pick on purpose. Gobi Brown is noticeably darker, more muted than Mid Mustard Khaki.

Can I use Gobi Brown instead of Mid Mustard Khaki?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Gobi Brown is noticeably darker, more muted than Mid Mustard Khaki.

Can I use Mid Mustard Khaki instead of Gobi Brown?

The same difference applies the other way round: Mid Mustard Khaki is noticeably 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.