Turquoise vs Stegadon Scale Green

How close are they?

ΔE 15.0, loose: different enough that you should pick on purpose. Stegadon Scale Green is noticeably darker, more muted, warmer than Turquoise.

Can I use Stegadon Scale Green instead of Turquoise?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Stegadon Scale Green is noticeably darker, more muted, warmer than Turquoise.

Can I use Turquoise instead of Stegadon Scale Green?

The same difference applies the other way round: Turquoise 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.