Gauss Blaster Green vs Sky Blue

How close are they?

ΔE 23.1, loose: different enough that you should pick on purpose. Sky Blue is noticeably lighter, more muted, cooler than Gauss Blaster Green.

Can I use Sky Blue instead of Gauss Blaster Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Sky Blue is noticeably lighter, more muted, cooler than Gauss Blaster Green.

Can I use Gauss Blaster Green instead of Sky Blue?

The same difference applies the other way round: Gauss Blaster Green is noticeably darker, more saturated, 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.