ΔE 11.3, fair: the same colour family, but not a straight swap. Donkey Grey is a little darker, more muted than Wraithbone.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Donkey Grey is a little darker, more muted than Wraithbone.
The same difference applies the other way round: Wraithbone is a little lighter, more saturated.
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 Donkey Grey on the colour wheel
All matches: Wraithbone equivalents · Donkey Grey equivalents