ΔE 12.0, fair: the same colour family, but not a straight swap. Phthalo Green (Yellow Shade) is a little darker, more muted, cooler than Goblin Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Phthalo Green (Yellow Shade) is a little darker, more muted, cooler than Goblin Green.
The same difference applies the other way round: Goblin Green is a little lighter, more saturated, 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 Phthalo Green (Yellow Shade) on the colour wheel
All matches: Goblin Green equivalents · Phthalo Green (Yellow Shade) equivalents