Kabalite Green vs Meredius Blue

How close are they?

ΔE 27.1, loose: different enough that you should pick on purpose. Meredius Blue is noticeably lighter, cooler than Kabalite Green.

Can I use Meredius Blue instead of Kabalite Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Meredius Blue is noticeably lighter, cooler than Kabalite Green.

Can I use Kabalite Green instead of Meredius Blue?

The same difference applies the other way round: Kabalite Green is noticeably darker, 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.