ΔE 15.7, loose: different enough that you should pick on purpose. Pastel Green is a little darker, cooler than Skeleton Legion.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Pastel Green is a little darker, cooler than Skeleton Legion.
The same difference applies the other way round: Skeleton Legion is a little lighter, 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 Legion on the colour wheel See Pastel Green on the colour wheel
All matches: Skeleton Legion equivalents · Pastel Green equivalents