ΔE 10.7, fair: the same colour family, but not a straight swap. Pale Blue is a little darker, cooler than Armour Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Pale Blue is a little darker, cooler than Armour Grey.
The same difference applies the other way round: Armour Grey is a little lighter, 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 Armour Grey on the colour wheel See Pale Blue on the colour wheel
All matches: Armour Grey equivalents · Pale Blue equivalents