Zandri Dust vs Sandy Brown

How close are they?

ΔE 6.9, close: similar, with a visible difference side by side. Sandy Brown is a little darker than Zandri Dust.

Can I use Sandy Brown instead of Zandri Dust?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Sandy Brown is a little darker than Zandri Dust.

Can I use Zandri Dust instead of Sandy Brown?

The same difference applies the other way round: Zandri Dust is a little lighter.

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.