Webbing Khaki vs Yellow Ochre

How close are they?

ΔE 16.7, loose: different enough that you should pick on purpose. Yellow Ochre is a little darker, much more saturated, warmer than Webbing Khaki.

Can I use Yellow Ochre instead of Webbing Khaki?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Yellow Ochre is a little darker, much more saturated, warmer than Webbing Khaki.

Can I use Webbing Khaki instead of Yellow Ochre?

The same difference applies the other way round: Webbing Khaki is a little lighter, much more muted, 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.