Agrellan Earth vs Raw Umber

How close are they?

ΔE 9.7, close: similar, with a visible difference side by side. Raw Umber is more muted than Agrellan Earth.

Can I use Raw Umber instead of Agrellan Earth?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Raw Umber is more muted than Agrellan Earth.

Can I use Agrellan Earth instead of Raw Umber?

The same difference applies the other way round: Agrellan Earth is 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.