Green Tone vs Moss Green

How close are they?

ΔE 34.7, loose: different enough that you should pick on purpose. Moss Green is noticeably lighter, more saturated, cooler than Green Tone.

Can I use Moss Green instead of Green Tone?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 35). Moss Green is noticeably lighter, more saturated, cooler than Green Tone.

Can I use Green Tone instead of Moss Green?

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