Disgusting Slime vs Moth Green

How close are they?

ΔE 19.7, loose: different enough that you should pick on purpose. Moth Green is a little darker, cooler than Disgusting Slime.

Can I use Moth Green instead of Disgusting Slime?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Moth Green is a little darker, cooler than Disgusting Slime.

Can I use Disgusting Slime instead of Moth Green?

The same difference applies the other way round: Disgusting Slime is a little lighter, 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.