Sylvaneth Bark vs Gyzmo Fur

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Gyzmo Fur is a little lighter, more saturated than Sylvaneth Bark.

Can I use Gyzmo Fur instead of Sylvaneth Bark?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Gyzmo Fur is a little lighter, more saturated than Sylvaneth Bark.

Can I use Sylvaneth Bark instead of Gyzmo Fur?

The same difference applies the other way round: Sylvaneth Bark is a little darker, 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.