Fire Lizard vs Arrakis Brown

How close are they?

ΔE 6.9, close: similar, with a visible difference side by side. Arrakis Brown is more muted than Fire Lizard.

Can I use Arrakis Brown instead of Fire Lizard?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Arrakis Brown is more muted than Fire Lizard.

Can I use Fire Lizard instead of Arrakis Brown?

The same difference applies the other way round: Fire Lizard 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.