ΔE 27.4, loose: different enough that you should pick on purpose. Goblin Green is noticeably lighter, warmer than Phthalo Green (Yellow Shade).
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Goblin Green is noticeably lighter, warmer than Phthalo Green (Yellow Shade).
The same difference applies the other way round: Phthalo Green (Yellow Shade) is noticeably darker, 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 Phthalo Green (Yellow Shade) on the colour wheel See Goblin Green on the colour wheel
All matches: Phthalo Green (Yellow Shade) equivalents · Goblin Green equivalents