ΔE 13.4, fair: the same colour family, but not a straight swap. Fenrisian Grey is a little lighter, more saturated than Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Fenrisian Grey is a little lighter, more saturated than Grey.
The same difference applies the other way round: Grey is a little darker, 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 Grey on the colour wheel See Fenrisian Grey on the colour wheel
All matches: Grey equivalents · Fenrisian Grey equivalents