ΔE 21.4, loose: different enough that you should pick on purpose. Bright Green is noticeably lighter, more saturated than Greenskin.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Bright Green is noticeably lighter, more saturated than Greenskin.
The same difference applies the other way round: Greenskin is noticeably darker, 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 Greenskin on the colour wheel See Bright Green on the colour wheel
All matches: Greenskin equivalents · Bright Green equivalents