ΔE 6.8, close: similar, with a visible difference side by side. Pale Grey Blue is a little darker than Pale Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Pale Grey Blue is a little darker than Pale Blue.
The same difference applies the other way round: Pale Blue 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 Pale Blue on the colour wheel See Pale Grey Blue on the colour wheel
All matches: Pale Blue equivalents · Pale Grey Blue equivalents