Yoda Green vs Medium Grey Blue

How close are they?

ΔE 16.6, loose: different enough that you should pick on purpose. Medium Grey Blue is noticeably lighter, more muted, cooler than Yoda Green.

Can I use Medium Grey Blue instead of Yoda Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Medium Grey Blue is noticeably lighter, more muted, cooler than Yoda Green.

Can I use Yoda Green instead of Medium Grey Blue?

The same difference applies the other way round: Yoda Green is noticeably darker, more saturated, 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.