Sotek Green vs Cobalt Green

How close are they?

ΔE 17.1, loose: different enough that you should pick on purpose. Cobalt Green is noticeably lighter, more saturated, warmer than Sotek Green.

Can I use Cobalt Green instead of Sotek Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Cobalt Green is noticeably lighter, more saturated, warmer than Sotek Green.

Can I use Sotek Green instead of Cobalt Green?

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