ΔE 10.1, fair: the same colour family, but not a straight swap. Battleship Grey is more muted than Light Sky Blue. They are different kinds of paint: AMMO by Mig Light Sky Blue is an opaque base/layer paint and Army Painter Battleship Grey is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Battleship Grey is more muted than Light Sky Blue. They are different kinds of paint.
The same difference applies the other way round: Light Sky Blue is 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 Light Sky Blue on the colour wheel See Battleship Grey on the colour wheel
All matches: Light Sky Blue equivalents · Battleship Grey equivalents