ΔE 7.3, close: similar, with a visible difference side by side. Blue Grey Pale is a little lighter, more muted than IJN Gray (Kure Arsenal).
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Blue Grey Pale is a little lighter, more muted than IJN Gray (Kure Arsenal).
The same difference applies the other way round: IJN Gray (Kure Arsenal) 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 IJN Gray (Kure Arsenal) on the colour wheel See Blue Grey Pale on the colour wheel
All matches: IJN Gray (Kure Arsenal) equivalents · Blue Grey Pale equivalents