Bronze Yellow vs Khaki Drill

How close are they?

ΔE 30.5, loose: different enough that you should pick on purpose. Khaki Drill is noticeably darker, much more muted, warmer than Bronze Yellow.

Can I use Khaki Drill instead of Bronze Yellow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 31). Khaki Drill is noticeably darker, much more muted, warmer than Bronze Yellow.

Can I use Bronze Yellow instead of Khaki Drill?

The same difference applies the other way round: Bronze Yellow is noticeably lighter, much 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.