Exile Green vs Morning Sky

How close are they?

ΔE 18.9, loose: different enough that you should pick on purpose. Morning Sky is a little lighter, cooler than Exile Green.

Can I use Morning Sky instead of Exile Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Morning Sky is a little lighter, cooler than Exile Green.

Can I use Exile Green instead of Morning Sky?

The same difference applies the other way round: Exile Green is a little 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.