You're wrong. For starters Gambit accelerates energy that already exists within an object, causing it to combust on impact, whereas Boom Boom is mainly just creating explosive balls of energy on set timers or that explode on impact. There's a similarity, but Gambit can do far more with his abilities such as dissolving objects by tearing apart their molecular structure, he can enhance his body slightly my charging it, and he can also super charge his healing abilities. Gambit's power set is far more advanced than Boom Boom's.