Gemstone Red vs Bubblegum Crisis

How close are they?

ΔE 41.1, loose: different enough that you should pick on purpose. Bubblegum Crisis is noticeably lighter, more muted, cooler than Gemstone Red.

Can I use Bubblegum Crisis instead of Gemstone Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 41). Bubblegum Crisis is noticeably lighter, more muted, cooler than Gemstone Red.

Can I use Gemstone Red instead of Bubblegum Crisis?

The same difference applies the other way round: Gemstone Red is noticeably darker, more saturated, 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.