Ushabti Bone vs Zombie Rot

How close are they?

ΔE 9.3, close: similar, with a visible difference side by side. Zombie Rot is more saturated, cooler than Ushabti Bone.

Can I use Zombie Rot instead of Ushabti Bone?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Zombie Rot is more saturated, cooler than Ushabti Bone.

Can I use Ushabti Bone instead of Zombie Rot?

The same difference applies the other way round: Ushabti Bone is more muted, 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.