Mid Khaki Drill vs Caramel Brown

How close are they?

ΔE 15.5, loose: different enough that you should pick on purpose. Caramel Brown is noticeably darker, warmer than Mid Khaki Drill.

Can I use Caramel Brown instead of Mid Khaki Drill?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Caramel Brown is noticeably darker, warmer than Mid Khaki Drill.

Can I use Mid Khaki Drill instead of Caramel Brown?

The same difference applies the other way round: Mid Khaki Drill is noticeably lighter, 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.