Sun-bleached Bone vs Pale Sand

How close are they?

ΔE 7.5, close: similar, with a visible difference side by side. Pale Sand is a little lighter, more muted than Sun-bleached Bone.

Can I use Pale Sand instead of Sun-bleached Bone?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Pale Sand is a little lighter, more muted than Sun-bleached Bone.

Can I use Sun-bleached Bone instead of Pale Sand?

The same difference applies the other way round: Sun-bleached Bone is a little darker, 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.