ΔE 6.6, close: similar, with a visible difference side by side. Pale Blue is a little lighter, warmer than IJN Gray.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Pale Blue is a little lighter, warmer than IJN Gray.
The same difference applies the other way round: IJN Gray is a little darker, cooler.
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 on the colour wheel See Pale Blue on the colour wheel
All matches: IJN Gray equivalents · Pale Blue equivalents