ΔE 7.5, close: similar, with a visible difference side by side. Pistachio is more saturated than Moss Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Pistachio is more saturated than Moss Green.
The same difference applies the other way round: Moss Green is more muted.
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 Moss Green on the colour wheel See Pistachio on the colour wheel
All matches: Moss Green equivalents · Pistachio equivalents