Neptune Glow vs Samurai Green

How close are they?

ΔE 23.8, loose: different enough that you should pick on purpose. Samurai Green is noticeably darker, more saturated, warmer than Neptune Glow.

Can I use Samurai Green instead of Neptune Glow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Samurai Green is noticeably darker, more saturated, warmer than Neptune Glow.

Can I use Neptune Glow instead of Samurai Green?

The same difference applies the other way round: Neptune Glow is noticeably lighter, 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.