ΔE 9.0, close: similar, with a visible difference side by side. IJN Gray Mitsubishi is a little lighter, more muted, cooler than Fenrisian Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). IJN Gray Mitsubishi is a little lighter, more muted, cooler than Fenrisian Grey.
The same difference applies the other way round: Fenrisian Grey is a little darker, more saturated, 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 Fenrisian Grey on the colour wheel See IJN Gray Mitsubishi on the colour wheel
All matches: Fenrisian Grey equivalents · IJN Gray Mitsubishi equivalents