ΔE 10.3, fair: the same colour family, but not a straight swap. Grey Seer is a little darker, more muted than Sword Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Grey Seer is a little darker, more muted than Sword Grey.
The same difference applies the other way round: Sword 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 Sword Grey on the colour wheel See Grey Seer on the colour wheel
All matches: Sword Grey equivalents · Grey Seer equivalents