ΔE 16.6, loose: different enough that you should pick on purpose. Sail Color is noticeably darker, more saturated than Screaming Skull.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Sail Color is noticeably darker, more saturated than Screaming Skull.
The same difference applies the other way round: Screaming Skull is noticeably lighter, 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 Screaming Skull on the colour wheel See Sail Color on the colour wheel
All matches: Screaming Skull equivalents · Sail Color equivalents