Alpha Blue vs Cygnar Blue Base

How close are they?

ΔE 26.8, loose: different enough that you should pick on purpose. Cygnar Blue Base is noticeably darker, much more saturated than Alpha Blue.

Can I use Cygnar Blue Base instead of Alpha Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Cygnar Blue Base is noticeably darker, much more saturated than Alpha Blue.

Can I use Alpha Blue instead of Cygnar Blue Base?

The same difference applies the other way round: Alpha Blue is noticeably lighter, much more muted.

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.