ΔE 5.4, very close: most people won’t see a difference side by side. Grey Castle is more muted than Starship Filth. They are different kinds of paint: AMMO by Mig Starship Filth is an ink, glaze or transparent paint and Army Painter Grey Castle is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 5). Grey Castle is more muted than Starship Filth. They are different kinds of paint.
The same difference applies the other way round: Starship Filth is 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 Starship Filth on the colour wheel See Grey Castle on the colour wheel
All matches: Starship Filth equivalents · Grey Castle equivalents