Fluor Blue vs Fluorescent Cold Green

How close are they?

ΔE 53.8, loose: different enough that you should pick on purpose. Fluorescent Cold Green is noticeably darker, more muted, warmer than Fluor Blue.

Can I use Fluorescent Cold Green instead of Fluor Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 54). Fluorescent Cold Green is noticeably darker, more muted, warmer than Fluor Blue.

Can I use Fluor Blue instead of Fluorescent Cold Green?

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