ΔE 20.5, loose: different enough that you should pick on purpose. Blue is a little lighter, much more saturated, warmer than Asurmen Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Blue is a little lighter, much more saturated, warmer than Asurmen Blue.
The same difference applies the other way round: Asurmen Blue is a little darker, much more muted, 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 Asurmen Blue on the colour wheel See Blue on the colour wheel
All matches: Asurmen Blue equivalents · Blue equivalents