ΔE 9.2, close: similar, with a visible difference side by side. Green Sky is a little darker, cooler than Goblin Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Green Sky is a little darker, cooler than Goblin Green.
The same difference applies the other way round: Goblin Green 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 Goblin Green on the colour wheel See Green Sky on the colour wheel
All matches: Goblin Green equivalents · Green Sky equivalents