'Jack Bone vs Ivory

How close are they?

ΔE 17.4, loose: different enough that you should pick on purpose. Ivory is a little lighter, much more muted, warmer than 'Jack Bone.

Can I use Ivory instead of 'Jack Bone?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Ivory is a little lighter, much more muted, warmer than 'Jack Bone.

Can I use 'Jack Bone instead of Ivory?

The same difference applies the other way round: 'Jack Bone is a little darker, much more saturated, 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.