ΔE 8.4, close: similar, with a visible difference side by side. IJN Ash Grey is a little lighter, more muted than Fury Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). IJN Ash Grey is a little lighter, more muted than Fury Green.
The same difference applies the other way round: Fury Green is a little darker, more saturated.
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 Fury Green on the colour wheel See IJN Ash Grey on the colour wheel
All matches: Fury Green equivalents · IJN Ash Grey equivalents