ΔE 10.6, fair: the same colour family, but not a straight swap. Ivory is noticeably darker, warmer than Linen White.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Ivory is noticeably darker, warmer than Linen White.
The same difference applies the other way round: Linen White is noticeably lighter, cooler.
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 Linen White on the colour wheel See Ivory on the colour wheel
All matches: Linen White equivalents · Ivory equivalents