Mithril vs Green Pearl

How close are they?

ΔE 16.0, loose: different enough that you should pick on purpose. Green Pearl is noticeably darker, more saturated than Mithril.

Can I use Green Pearl instead of Mithril?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Green Pearl is noticeably darker, more saturated than Mithril.

Can I use Mithril instead of Green Pearl?

The same difference applies the other way round: Mithril 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.