Arabic Shadow vs Ochre Brown

How close are they?

ΔE 9.4, close: similar, with a visible difference side by side. Ochre Brown is a little lighter, warmer than Arabic Shadow.

Can I use Ochre Brown instead of Arabic Shadow?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Ochre Brown is a little lighter, warmer than Arabic Shadow.

Can I use Arabic Shadow instead of Ochre Brown?

The same difference applies the other way round: Arabic Shadow is a little darker, 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.