ΔE 4.7, very close: most people won’t see a difference side by side. Fenrisian Grey is a little lighter than Runic Cobalt.
✓ Army Painter Fanatic conversion chart lists these two as equivalents.
Yes, for most jobs. Very close match (ΔE 5). Fenrisian Grey is a little lighter than Runic Cobalt.
The same difference applies the other way round: Runic Cobalt is a little darker.
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 Runic Cobalt on the colour wheel See Fenrisian Grey on the colour wheel
All matches: Runic Cobalt equivalents · Fenrisian Grey equivalents