Oozing Vomit vs Karak Stone

How close are they?

ΔE 18.5, loose: different enough that you should pick on purpose. Karak Stone is much more muted, warmer than Oozing Vomit.

Can I use Karak Stone instead of Oozing Vomit?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Karak Stone is much more muted, warmer than Oozing Vomit.

Can I use Oozing Vomit instead of Karak Stone?

The same difference applies the other way round: Oozing Vomit is much more saturated, cooler.

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.