ΔE 12.0, fair: the same colour family, but not a straight swap. Blue Glacier is more saturated than Battleship Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Blue Glacier is more saturated than Battleship Grey.
The same difference applies the other way round: Battleship Grey is more muted.
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 Battleship Grey on the colour wheel See Blue Glacier on the colour wheel
All matches: Battleship Grey equivalents · Blue Glacier equivalents