Pitch is a characteristic of tone. Within a sound's tone you have pitch, quality, amplification, and other such elements. No, from an audio science perspective you can't tweak one human's voice to sound reasonably realistically like another's voice. Plus, sound file quality plays a big part in this. Start with too low af a bit depth and you'll do what a lot of audio mods do by over processing which is to phase the sound, which sounds like it's in a tin can. Cadence, rhythm, annunciation, vocalisation, none of these things can be edited by applying a sound filter or playing with pitch. You may come up with something that sounds interesting but from the perspective of the science of sound what's being examined here isn't possible.