Bison-Beast vs Fulgrim Pink

How close are they?

ΔE 31.7, loose: different enough that you should pick on purpose. Fulgrim Pink is a little lighter, much more saturated, cooler than Bison-Beast.

Can I use Fulgrim Pink instead of Bison-Beast?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 32). Fulgrim Pink is a little lighter, much more saturated, cooler than Bison-Beast.

Can I use Bison-Beast instead of Fulgrim Pink?

The same difference applies the other way round: Bison-Beast is a little darker, much 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.