I have a 2003 620. The handlebars are bent. I found some from a 2008 Ducati Monster 695. Will they fit my bike?

Yup.  Same bar.

If that doesn't work out for you, we have an aftermarket "dirt bike" steel handle bar that has the identical bend. It is also somewhat stronger, as it uses thicker walled tubing once inboard from the handgrips. Our bar does require drilling of the set pin locating holes.