ΔE 21.2, loose: different enough that you should pick on purpose. Elixir Green is a little lighter, much more saturated, warmer than Turnbull Turquoise.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Elixir Green is a little lighter, much more saturated, warmer than Turnbull Turquoise.
The same difference applies the other way round: Turnbull Turquoise is a little darker, much 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 Turnbull Turquoise on the colour wheel See Elixir Green on the colour wheel
All matches: Turnbull Turquoise equivalents · Elixir Green equivalents