ΔE 27.8, loose: different enough that you should pick on purpose. Orc Skin is a little lighter, more saturated, warmer than Elixir Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Orc Skin is a little lighter, more saturated, warmer than Elixir Green.
The same difference applies the other way round: Elixir Green is a little darker, more muted, cooler.
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 Elixir Green on the colour wheel See Orc Skin on the colour wheel
All matches: Elixir Green equivalents · Orc Skin equivalents