Slimer Green vs Goblin Green

How close are they?

ΔE 18.0, loose: different enough that you should pick on purpose. Goblin Green is a little lighter, much more saturated than Slimer Green.

Can I use Goblin Green instead of Slimer Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Goblin Green is a little lighter, much more saturated than Slimer Green.

Can I use Slimer Green instead of Goblin Green?

The same difference applies the other way round: Slimer Green is a little darker, much more muted.

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.