Pistachio vs Moon Dust

How close are they?

ΔE 8.9, close: similar, with a visible difference side by side. Moon Dust is a little darker, more muted than Pistachio.

Can I use Moon Dust instead of Pistachio?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Moon Dust is a little darker, more muted than Pistachio.

Can I use Pistachio instead of Moon Dust?

The same difference applies the other way round: Pistachio is a little lighter, 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.