Why ?

@Xanathar the beholder Well...

• They're both very handsome and popular.

• They're both stubborn and refused to be talked out of their plans.

• They both believed they were doing something right due to truly believing someone else was evil.

Slightly. They’re similar but Gaston was misogynistic and a just a jerk while Jason at least genuinely loved Chrissy.

Gaston was also more egotistical than Jason.