Green Sky vs Gauss Blaster Green

How close are they?

ΔE 15.1, loose: different enough that you should pick on purpose. Gauss Blaster Green is a little lighter, cooler than Green Sky.

Can I use Gauss Blaster Green instead of Green Sky?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Gauss Blaster Green is a little lighter, cooler than Green Sky.

Can I use Green Sky instead of Gauss Blaster Green?

The same difference applies the other way round: Green Sky 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.