ΔE 8.5, close: similar, with a visible difference side by side. Ivory is a little darker, more muted, cooler than Ivory White.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Ivory is a little darker, more muted, cooler than Ivory White.
The same difference applies the other way round: Ivory White is a little lighter, more saturated, 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 Ivory White on the colour wheel See Ivory on the colour wheel
All matches: Ivory White equivalents · Ivory equivalents