ΔE 21.9, loose: different enough that you should pick on purpose. Acid Green is noticeably lighter, more saturated than Algae Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Acid Green is noticeably lighter, more saturated than Algae Green.
The same difference applies the other way round: Algae Green is noticeably darker, more muted.
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 Algae Green on the colour wheel See Acid Green on the colour wheel
All matches: Algae Green equivalents · Acid Green equivalents