ΔE 29.7, loose: different enough that you should pick on purpose. Acid Green is noticeably darker, more muted, warmer than Aeldari Emerald.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 30). Acid Green is noticeably darker, more muted, warmer than Aeldari Emerald.
The same difference applies the other way round: Aeldari Emerald is noticeably lighter, more saturated, 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 Aeldari Emerald on the colour wheel See Acid Green on the colour wheel
All matches: Aeldari Emerald equivalents · Acid Green equivalents