ΔE 12.5, fair: the same colour family, but not a straight swap. Bright Slate Grey is a little darker, more muted than Battleship Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Bright Slate Grey is a little darker, more muted than Battleship Grey.
The same difference applies the other way round: Battleship Grey is a little lighter, 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 Battleship Grey on the colour wheel See Bright Slate Grey on the colour wheel
All matches: Battleship Grey equivalents · Bright Slate Grey equivalents