Spring Green vs Sick Green

How close are they?

ΔE 10.7, fair: the same colour family, but not a straight swap. Sick Green is noticeably darker than Spring Green.

Can I use Sick Green instead of Spring Green?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Sick Green is noticeably darker than Spring Green.

Can I use Spring Green instead of Sick Green?

The same difference applies the other way round: Spring Green is noticeably lighter.

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.