ΔE 6.9, close: similar, with a visible difference side by side. Aggressor Gray is a little darker than IJN Hull Color/Kure.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Aggressor Gray is a little darker than IJN Hull Color/Kure.
The same difference applies the other way round: IJN Hull Color/Kure is a little lighter.
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 IJN Hull Color/Kure on the colour wheel See Aggressor Gray on the colour wheel
All matches: IJN Hull Color/Kure equivalents · Aggressor Gray equivalents