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