ΔE 9.1, close: similar, with a visible difference side by side. Schilf Green is a little lighter than Forest Green (FS34079).
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Schilf Green is a little lighter than Forest Green (FS34079).
The same difference applies the other way round: Forest Green (FS34079) is a little darker.
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 Forest Green (FS34079) on the colour wheel See Schilf Green on the colour wheel
All matches: Forest Green (FS34079) equivalents · Schilf Green equivalents