ΔE 17.3, loose: different enough that you should pick on purpose. Northern Flesh is noticeably lighter, more muted than Wraithbone.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Northern Flesh is noticeably lighter, more muted than Wraithbone.
The same difference applies the other way round: Wraithbone is noticeably darker, 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 Northern Flesh on the colour wheel
All matches: Wraithbone equivalents · Northern Flesh equivalents