This is a common source of confusion for trans women learning voice training. Pitch is the frequencies themselves, resonance is the amplification or attenuation of those frequencies. https://www.youtube.com/watch?v=21ZfGPp-Ves
Making your pitch too high without changing resonance will make you sound like a cartoon character and is a typical kind of way for a guy to pretend to sound like a girl. It's important to train resonance and raising your larynx because it will make sustaining a higher pitch easier and reduce the appearance of Adams apple.