Gauss Blaster Green vs Meredius Blue

How close are they?

ΔE 19.5, loose: different enough that you should pick on purpose. Meredius Blue is a little darker, more saturated, cooler than Gauss Blaster Green.

Can I use Meredius Blue instead of Gauss Blaster Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Meredius Blue is a little darker, more saturated, cooler than Gauss Blaster Green.

Can I use Gauss Blaster Green instead of Meredius Blue?

The same difference applies the other way round: Gauss Blaster Green is a little lighter, more muted, 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.