ΔE 9.3, close: similar, with a visible difference side by side. Dark Green RLM71 is more saturated, warmer than Viridian Grim.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Dark Green RLM71 is more saturated, warmer than Viridian Grim.
The same difference applies the other way round: Viridian Grim 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 Viridian Grim on the colour wheel See Dark Green RLM71 on the colour wheel
All matches: Viridian Grim equivalents · Dark Green RLM71 equivalents