Warpstone Glow vs Flubber Green

How close are they?

ΔE 23.5, loose: different enough that you should pick on purpose. Flubber Green is noticeably lighter, much more saturated than Warpstone Glow.

Can I use Flubber Green instead of Warpstone Glow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Flubber Green is noticeably lighter, much more saturated than Warpstone Glow.

Can I use Warpstone Glow instead of Flubber Green?

The same difference applies the other way round: Warpstone Glow 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.