What's different is nearly everything that goes on inside. Human brains aren't a big pile of linear algebra with some softmaxes sprinkled in trained to parrot the Internet. LLMs are.
Humans with their tiny amount of data and "special sauce" can produce much more consistent results even though they may be giving the objectively wrong answer. They can also tell you when they don't know about a certain topic, rather than lying compulsively (unless that person has a disorder to lie compulsively...).
More and more researches are showing via brain scans that we don’t have free will. Our subconscious makes the decision before our “conscious” brain makes the choice. We think we have free will but the decision to do something was made before you “make” the choice.
We are just products of what we have experienced. What we have been trained on.
Maybe yours isn't, but mine certainly is. Intelligence is an emergent property of systems that get good at prediction.