ΔE 6.5, close: similar, with a visible difference side by side. Black Green RLM70 is a little darker, more muted than Hydra Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Black Green RLM70 is a little darker, more muted than Hydra Green.
The same difference applies the other way round: Hydra Green is a little lighter, more saturated.
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 Hydra Green on the colour wheel See Black Green RLM70 on the colour wheel
All matches: Hydra Green equivalents · Black Green RLM70 equivalents