ΔE 14.6, fair: the same colour family, but not a straight swap. Nighthaunt Gloom is much more saturated than Gryph-Charger Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Nighthaunt Gloom is much more saturated than Gryph-Charger Grey.
The same difference applies the other way round: Gryph-Charger Grey is much 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 Gryph-Charger Grey on the colour wheel See Nighthaunt Gloom on the colour wheel
All matches: Gryph-Charger Grey equivalents · Nighthaunt Gloom equivalents