ΔE 8.3, close: similar, with a visible difference side by side. Polished Bone is a little lighter, warmer than Wraithbone.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Polished Bone is a little lighter, warmer than Wraithbone.
The same difference applies the other way round: Wraithbone is a little darker, 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 Wraithbone on the colour wheel See Polished Bone on the colour wheel
All matches: Wraithbone equivalents · Polished Bone equivalents