ΔE 28.6, loose: different enough that you should pick on purpose. Acid Green is much more saturated, cooler than Skeleton Horde.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Acid Green is much more saturated, cooler than Skeleton Horde.
The same difference applies the other way round: Skeleton Horde is much more muted, warmer.
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 Horde on the colour wheel See Acid Green on the colour wheel
All matches: Skeleton Horde equivalents · Acid Green equivalents