ΔE 12.8, fair: the same colour family, but not a straight swap. Smalt Hue is a little lighter, warmer than Consul Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Smalt Hue is a little lighter, warmer than Consul Blue.
The same difference applies the other way round: Consul Blue 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 Consul Blue on the colour wheel See Smalt Hue on the colour wheel
All matches: Consul Blue equivalents · Smalt Hue equivalents