ΔE 21.9, loose: different enough that you should pick on purpose. Andrea Blue is noticeably darker, more saturated, cooler than Smalt Hue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Andrea Blue is noticeably darker, more saturated, cooler than Smalt Hue.
The same difference applies the other way round: Smalt Hue is noticeably 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 Smalt Hue on the colour wheel See Andrea Blue on the colour wheel
All matches: Smalt Hue equivalents · Andrea Blue equivalents