New Iraqi Army Sand vs Morghast Bone

How close are they?

ΔE 7.3, close: similar, with a visible difference side by side. Morghast Bone is more muted, cooler than New Iraqi Army Sand.

Can I use Morghast Bone instead of New Iraqi Army Sand?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Morghast Bone is more muted, cooler than New Iraqi Army Sand.

Can I use New Iraqi Army Sand instead of Morghast Bone?

The same difference applies the other way round: New Iraqi Army Sand is more saturated, 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.