ΔE 8.5, close: similar, with a visible difference side by side. Russian AF Grey N.4 is a little darker, warmer than Pastel Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Russian AF Grey N.4 is a little darker, warmer than Pastel Green.
The same difference applies the other way round: Pastel Green is a little lighter, 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 Pastel Green on the colour wheel See Russian AF Grey N.4 on the colour wheel
All matches: Pastel Green equivalents · Russian AF Grey N.4 equivalents