ΔE 15.6, loose: different enough that you should pick on purpose. Snake Fang is noticeably lighter, more saturated than Skeleton Bone.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Snake Fang is noticeably lighter, more saturated than Skeleton Bone.
The same difference applies the other way round: Skeleton Bone is noticeably darker, more muted.
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 Skeleton Bone on the colour wheel See Snake Fang on the colour wheel
All matches: Skeleton Bone equivalents · Snake Fang equivalents