ΔE 9.9, close: similar, with a visible difference side by side. Ardennes Green is a little lighter, more saturated than Elf Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Ardennes Green is a little lighter, more saturated than Elf Green.
The same difference applies the other way round: Elf Green is a little 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 Elf Green on the colour wheel See Ardennes Green on the colour wheel
All matches: Elf Green equivalents · Ardennes Green equivalents