ΔE 11.2, fair: the same colour family, but not a straight swap. Faded Ultramarine is a little lighter, warmer than Wolf Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Faded Ultramarine is a little lighter, warmer than Wolf Grey.
The same difference applies the other way round: Wolf Grey is a little darker, cooler.
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 Wolf Grey on the colour wheel See Faded Ultramarine on the colour wheel
All matches: Wolf Grey equivalents · Faded Ultramarine equivalents