Matt Goblin Green vs Ink Green

How close are they?

ΔE 25.3, loose: different enough that you should pick on purpose. Ink Green is noticeably darker, more saturated than Matt Goblin Green.

Can I use Ink Green instead of Matt Goblin Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Ink Green is noticeably darker, more saturated than Matt Goblin Green.

Can I use Matt Goblin Green instead of Ink Green?

The same difference applies the other way round: Matt Goblin Green is noticeably lighter, 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.