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