ΔE 13.9, fair: the same colour family, but not a straight swap. Off-White is noticeably lighter, more saturated than Ivory Tusk.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Off-White is noticeably lighter, more saturated than Ivory Tusk.
The same difference applies the other way round: Ivory Tusk is noticeably darker, more muted.
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 Tusk on the colour wheel See Off-White on the colour wheel
All matches: Ivory Tusk equivalents · Off-White equivalents