Lucky 38 vs Ahriman Blue

How close are they?

ΔE 16.3, loose: different enough that you should pick on purpose. Ahriman Blue is a little darker, more saturated, cooler than Lucky 38.

Can I use Ahriman Blue instead of Lucky 38?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Ahriman Blue is a little darker, more saturated, cooler than Lucky 38.

Can I use Lucky 38 instead of Ahriman Blue?

The same difference applies the other way round: Lucky 38 is a little 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.