ΔE 11.0, fair: the same colour family, but not a straight swap. Ivory is a little darker, warmer than Medium Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Ivory is a little darker, warmer than Medium Green.
The same difference applies the other way round: Medium Green is a little 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 Medium Green on the colour wheel See Ivory on the colour wheel
All matches: Medium Green equivalents · Ivory equivalents