ΔE 13.8, fair: the same colour family, but not a straight swap. Wizards Orb is noticeably lighter, cooler than Emerald Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Wizards Orb is noticeably lighter, cooler than Emerald Green.
The same difference applies the other way round: Emerald Green is noticeably darker, 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 Emerald Green on the colour wheel See Wizards Orb on the colour wheel
All matches: Emerald Green equivalents · Wizards Orb equivalents