ΔE 7.7, close: similar, with a visible difference side by side. Vampiric Purple is more saturated than Purple Vanity.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Vampiric Purple is more saturated than Purple Vanity.
The same difference applies the other way round: Purple Vanity is more muted.
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 Purple Vanity on the colour wheel See Vampiric Purple on the colour wheel
All matches: Purple Vanity equivalents · Vampiric Purple equivalents