Blue Flux vs Blue Licks

How close are they?

ΔE 25.7, loose: different enough that you should pick on purpose. Blue Licks is a little darker, much more saturated, warmer than Blue Flux.

Can I use Blue Licks instead of Blue Flux?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Blue Licks is a little darker, much more saturated, warmer than Blue Flux.

Can I use Blue Flux instead of Blue Licks?

The same difference applies the other way round: Blue Flux is a little lighter, 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.