ΔE 5.7, very close: most people won’t see a difference side by side. Ivory is more muted, cooler than IDF Gray 1 (-1981 Sinai).
Yes, for most jobs. Very close match (ΔE 6). Ivory is more muted, cooler than IDF Gray 1 (-1981 Sinai).
The same difference applies the other way round: IDF Gray 1 (-1981 Sinai) is 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 IDF Gray 1 (-1981 Sinai) on the colour wheel See Ivory on the colour wheel
All matches: IDF Gray 1 (-1981 Sinai) equivalents · Ivory equivalents