Iroko vs Green Ochre

How close are they?

ΔE 15.6, loose: different enough that you should pick on purpose. Green Ochre is a little darker, more muted, cooler than Iroko.

Can I use Green Ochre instead of Iroko?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Green Ochre is a little darker, more muted, cooler than Iroko.

Can I use Iroko instead of Green Ochre?

The same difference applies the other way round: Iroko is a little lighter, more saturated, warmer.

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.