Plasmatic Bolt vs Cool Blue

How close are they?

ΔE 22.0, loose: different enough that you should pick on purpose. Cool Blue is noticeably darker, more muted than Plasmatic Bolt.

Can I use Cool Blue instead of Plasmatic Bolt?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Cool Blue is noticeably darker, more muted than Plasmatic Bolt.

Can I use Plasmatic Bolt instead of Cool Blue?

The same difference applies the other way round: Plasmatic Bolt is noticeably lighter, more saturated.

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.