Neptune Glow vs Soft Green

How close are they?

ΔE 19.5, loose: different enough that you should pick on purpose. Soft Green is noticeably darker, more muted, warmer than Neptune Glow.

Can I use Soft Green instead of Neptune Glow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Soft Green is noticeably darker, more muted, warmer than Neptune Glow.

Can I use Neptune Glow instead of Soft Green?

The same difference applies the other way round: Neptune Glow 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.