Sotek Green vs Zima Blue

How close are they?

ΔE 20.7, loose: different enough that you should pick on purpose. Zima Blue is a little lighter, more saturated, cooler than Sotek Green.

Can I use Zima Blue instead of Sotek Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Zima Blue is a little lighter, more saturated, cooler than Sotek Green.

Can I use Sotek Green instead of Zima Blue?

The same difference applies the other way round: Sotek Green is a little darker, more muted, warmer.

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.