ΔE 26.4, loose: different enough that you should pick on purpose. Elixir Green is noticeably darker, much more muted, cooler than Aeldari Emerald.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Elixir Green is noticeably darker, much more muted, cooler than Aeldari Emerald.
The same difference applies the other way round: Aeldari Emerald is noticeably lighter, much 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 Aeldari Emerald on the colour wheel See Elixir Green on the colour wheel
All matches: Aeldari Emerald equivalents · Elixir Green equivalents