ΔE 8.9, close: similar, with a visible difference side by side. Emerald is more saturated, warmer than Arphen Jade.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Emerald is more saturated, warmer than Arphen Jade.
The same difference applies the other way round: Arphen Jade is 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 Arphen Jade on the colour wheel See Emerald on the colour wheel
All matches: Arphen Jade equivalents · Emerald equivalents