They are not different physical processes. See explanation.
Work Step by Step
As explained on page 1187, in Fresnel diffraction, the point source and the screen are relatively close to the diffracting object. In contrast, Fraunhofer diffraction is a limiting case where the point source, screen, and diffracting object are so far apart that light rays can be approximated as being parallel to each other. They operate with the same physical principle of wave interference, though Fraunhofer diffraction is easier to treat mathematically.