ΔE 10.6, fair: the same colour family, but not a straight swap. Elf Green is a little darker, warmer than Space Dark Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Elf Green is a little darker, warmer than Space Dark Green.
The same difference applies the other way round: Space Dark 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 Space Dark Green on the colour wheel See Elf Green on the colour wheel
All matches: Space Dark Green equivalents · Elf Green equivalents