Faded Khaki vs Orange Ochre

How close are they?

ΔE 8.8, close: similar, with a visible difference side by side. Orange Ochre is a little darker, more muted than Faded Khaki.

Can I use Orange Ochre instead of Faded Khaki?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Orange Ochre is a little darker, more muted than Faded Khaki.

Can I use Faded Khaki instead of Orange Ochre?

The same difference applies the other way round: Faded Khaki is a little 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.