ΔE 6.7, close: similar, with a visible difference side by side. Foul Green is a little lighter than Interior Turquoise Green Soviet.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Foul Green is a little lighter than Interior Turquoise Green Soviet.
The same difference applies the other way round: Interior Turquoise Green Soviet 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 Interior Turquoise Green Soviet on the colour wheel See Foul Green on the colour wheel
All matches: Interior Turquoise Green Soviet equivalents · Foul Green equivalents