ΔE 22.2, loose: different enough that you should pick on purpose. Omega Blue is a little darker, more saturated, warmer than Dusty Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Omega Blue is a little darker, more saturated, warmer than Dusty Blue.
The same difference applies the other way round: Dusty Blue is a little lighter, 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 Dusty Blue on the colour wheel See Omega Blue on the colour wheel
All matches: Dusty Blue equivalents · Omega Blue equivalents