ΔE 7.5, close: similar, with a visible difference side by side. Medium Grey Blue is a little darker, cooler than Soft Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Medium Grey Blue is a little darker, cooler than Soft Green.
The same difference applies the other way round: Soft Green is a little lighter, warmer.
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 Soft Green on the colour wheel See Medium Grey Blue on the colour wheel
All matches: Soft Green equivalents · Medium Grey Blue equivalents