ΔE 18.4, loose: different enough that you should pick on purpose. Off-White is noticeably darker, much more saturated than Ivory Light.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Off-White is noticeably darker, much more saturated than Ivory Light.
The same difference applies the other way round: Ivory Light is noticeably lighter, much 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 Light on the colour wheel See Off-White on the colour wheel
All matches: Ivory Light equivalents · Off-White equivalents