ΔE 5.2, very close: most people won’t see a difference side by side. Ivory is a little darker, cooler than Heavy Warm White.
Yes, for most jobs. Very close match (ΔE 5). Ivory is a little darker, cooler than Heavy Warm White.
The same difference applies the other way round: Heavy Warm White is a little lighter, 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 Heavy Warm White on the colour wheel See Ivory on the colour wheel
All matches: Heavy Warm White equivalents · Ivory equivalents