ΔE 10.0, close: similar, with a visible difference side by side. Ivory White is a little darker, more muted, warmer than Ice Yellow.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Ivory White is a little darker, more muted, warmer than Ice Yellow.
The same difference applies the other way round: Ice Yellow is a little lighter, 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.
See Ice Yellow on the colour wheel See Ivory White on the colour wheel
All matches: Ice Yellow equivalents · Ivory White equivalents