Pale Sand vs Ivory

How close are they?

ΔE 7.9, close: similar, with a visible difference side by side. Ivory is a little darker, more muted, cooler than Pale Sand.

Can I use Ivory instead of Pale Sand?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Ivory is a little darker, more muted, cooler than Pale Sand.

Can I use Pale Sand instead of Ivory?

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