Marine Teal vs Scurvy Green

How close are they?

ΔE 15.9, loose: different enough that you should pick on purpose. Scurvy Green is a little lighter, warmer than Marine Teal.

Can I use Scurvy Green instead of Marine Teal?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Scurvy Green is a little lighter, warmer than Marine Teal.

Can I use Marine Teal instead of Scurvy Green?

The same difference applies the other way round: Marine Teal is a little darker, 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.