ΔE 11.8, fair: the same colour family, but not a straight swap. Dark Seagray BS381C 638 is a little darker, more muted than Daemonette Hide.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Dark Seagray BS381C 638 is a little darker, more muted than Daemonette Hide.
The same difference applies the other way round: Daemonette Hide 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 Daemonette Hide on the colour wheel See Dark Seagray BS381C 638 on the colour wheel
All matches: Daemonette Hide equivalents · Dark Seagray BS381C 638 equivalents