Red Goblin vs Dusken Green

How close are they?

ΔE 18.2, loose: different enough that you should pick on purpose. Dusken Green is noticeably lighter, cooler than Red Goblin.

Can I use Dusken Green instead of Red Goblin?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Dusken Green is noticeably lighter, cooler than Red Goblin.

Can I use Red Goblin instead of Dusken Green?

The same difference applies the other way round: Red Goblin is noticeably darker, 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.