ΔE 19.6, loose: different enough that you should pick on purpose. Space Grey is much more muted, cooler than Elixir Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Space Grey is much more muted, cooler than Elixir Green.
The same difference applies the other way round: Elixir Green is 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 Elixir Green on the colour wheel See Space Grey on the colour wheel
All matches: Elixir Green equivalents · Space Grey equivalents