ΔE 8.4, close: similar, with a visible difference side by side. Elf Green is a little darker, warmer than Olive Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Elf Green is a little darker, warmer than Olive Green.
The same difference applies the other way round: Olive Green is a little lighter, 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 Olive Green on the colour wheel See Elf Green on the colour wheel
All matches: Olive Green equivalents · Elf Green equivalents