Gauss Blaster Green vs Ion Blue

How close are they?

ΔE 22.7, loose: different enough that you should pick on purpose. Ion Blue is a little lighter, much more muted, cooler than Gauss Blaster Green.

Can I use Ion Blue instead of Gauss Blaster Green?

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

Can I use Gauss Blaster Green instead of Ion Blue?

The same difference applies the other way round: Gauss Blaster Green is a little darker, much 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.