If you're a Star Trek fan, I have a question for you

On the TV show, Star Trek the next generation, you have the starship Enterprise it's a Galaxy class starship, one of its weapons is a photon torpedo. In the second next generation movie, you have the Enterprise e which is a sovereign class ship, and it has quantum torpedoes.

Would it be possible to completely overhaul the Galaxy classes photon torpedoes and loaded with quantum torpedoes or would it be an impossibility?

This is just for fun. But a question I'm curious about nonetheless.