ΔE 13.6, fair: the same colour family, but not a straight swap. N3 Neutral Gray is a little darker, more muted than Occultist Cloak. They are different kinds of paint: Army Painter Occultist Cloak is a one-coat contrast-style paint and Golden N3 Neutral Gray is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). N3 Neutral Gray is a little darker, more muted than Occultist Cloak. They are different kinds of paint.
The same difference applies the other way round: Occultist Cloak 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 Occultist Cloak on the colour wheel See N3 Neutral Gray on the colour wheel
All matches: Occultist Cloak equivalents · N3 Neutral Gray equivalents