Data System Glow vs Goblinoid Green

How close are they?

ΔE 21.9, loose: different enough that you should pick on purpose. Goblinoid Green is a little darker, much more muted than Data System Glow.

Can I use Goblinoid Green instead of Data System Glow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Goblinoid Green is a little darker, much more muted than Data System Glow.

Can I use Data System Glow instead of Goblinoid Green?

The same difference applies the other way round: Data System Glow is a little lighter, much more saturated.

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.