Agrellan Earth vs Red Iron Oxide

How close are they?

ΔE 23.0, loose: different enough that you should pick on purpose. Red Iron Oxide is much more saturated, cooler than Agrellan Earth.

Can I use Red Iron Oxide instead of Agrellan Earth?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Red Iron Oxide is much more saturated, cooler than Agrellan Earth.

Can I use Agrellan Earth instead of Red Iron Oxide?

The same difference applies the other way round: Agrellan Earth is much more muted, 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.