ΔE 13.2, fair: the same colour family, but not a straight swap. Pale Yellow is more saturated, cooler than Ivory White.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Pale Yellow is more saturated, cooler than Ivory White.
The same difference applies the other way round: Ivory White is 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 Ivory White on the colour wheel See Pale Yellow on the colour wheel
All matches: Ivory White equivalents · Pale Yellow equivalents