Gauss Green vs Troll Snot Green

How close are they?

ΔE 28.3, loose: different enough that you should pick on purpose. Troll Snot Green is a little lighter, much more muted than Gauss Green.

Can I use Troll Snot Green instead of Gauss Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Troll Snot Green is a little lighter, much more muted than Gauss Green.

Can I use Gauss Green instead of Troll Snot Green?

The same difference applies the other way round: Gauss Green is a little darker, much more saturated.

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.