ΔE 9.2, close: similar, with a visible difference side by side. Black Green is a little darker than Ranger Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Black Green is a little darker than Ranger Green.
The same difference applies the other way round: Ranger Green is a little lighter.
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 Ranger Green on the colour wheel See Black Green on the colour wheel
All matches: Ranger Green equivalents · Black Green equivalents