ΔE 9.5, close: similar, with a visible difference side by side. Ivory is a little darker, more saturated, cooler than Vampire Fang.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Ivory is a little darker, more saturated, cooler than Vampire Fang.
The same difference applies the other way round: Vampire Fang is a little lighter, 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.
See Vampire Fang on the colour wheel See Ivory on the colour wheel
All matches: Vampire Fang equivalents · Ivory equivalents