ΔE 6.5, close: similar, with a visible difference side by side. Jade Green is a little lighter than Viridian Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Jade Green is a little lighter than Viridian Green.
The same difference applies the other way round: Viridian Green is a little darker.
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 Viridian Green on the colour wheel See Jade Green on the colour wheel
All matches: Viridian Green equivalents · Jade Green equivalents