Karak Stone vs Yellow Sand

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Yellow Sand is more muted than Karak Stone.

Can I use Yellow Sand instead of Karak Stone?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Yellow Sand is more muted than Karak Stone.

Can I use Karak Stone instead of Yellow Sand?

The same difference applies the other way round: Karak Stone is 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.