Green Ochre vs Iraqi Sand

How close are they?

ΔE 6.2, close: similar, with a visible difference side by side. Iraqi Sand is a little lighter, more muted than Green Ochre.

Can I use Iraqi Sand instead of Green Ochre?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Iraqi Sand is a little lighter, more muted than Green Ochre.

Can I use Green Ochre instead of Iraqi Sand?

The same difference applies the other way round: Green Ochre is a little darker, 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.