ΔE 6.8, close: similar, with a visible difference side by side. Bleached Bone is a little darker, warmer than Ivory.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Bleached Bone is a little darker, warmer than Ivory.
The same difference applies the other way round: Ivory 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 Ivory on the colour wheel See Bleached Bone on the colour wheel
All matches: Ivory equivalents · Bleached Bone equivalents