ΔE 22.5, loose: different enough that you should pick on purpose. Goblin Green is noticeably lighter, more saturated, warmer than Alizarin Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Goblin Green is noticeably lighter, more saturated, warmer than Alizarin Green.
The same difference applies the other way round: Alizarin Green is noticeably darker, 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 Alizarin Green on the colour wheel See Goblin Green on the colour wheel
All matches: Alizarin Green equivalents · Goblin Green equivalents