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