ΔE 16.8, loose: different enough that you should pick on purpose. Goblin Green is a little darker, much more saturated, warmer than Spectral Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Goblin Green is a little darker, much more saturated, warmer than Spectral Green.
The same difference applies the other way round: Spectral Green is a little lighter, much 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 Spectral Green on the colour wheel See Goblin Green on the colour wheel
All matches: Spectral Green equivalents · Goblin Green equivalents