Green Tone vs Biel-Tan Green

How close are they?

ΔE 24.3, loose: different enough that you should pick on purpose. Biel-Tan Green is noticeably lighter, much more saturated than Green Tone.

✓ Army Painter Fanatic conversion chart lists these two as equivalents.

Can I use Biel-Tan Green instead of Green Tone?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Biel-Tan Green is noticeably lighter, much more saturated than Green Tone.

Can I use Green Tone instead of Biel-Tan Green?

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