ΔE 30.6, loose: different enough that you should pick on purpose. Bag of Bones is a little darker, much more saturated than Skull Linen.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 31). Bag of Bones is a little darker, much more saturated than Skull Linen.
The same difference applies the other way round: Skull Linen is a little lighter, much 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 Skull Linen on the colour wheel See Bag of Bones on the colour wheel
All matches: Skull Linen equivalents · Bag of Bones equivalents