I believe there is no substantial difference. Both the AI and the brain transform noise into some conditional output. AIs can be original in the way they recombine things - there's space for adding a bit of originality there, and humans can be pretty reliant themselves on reusing other styles and concepts - so not as original as we like to imagine. Both humans and AIs are standing on the shoulders of giants. Intelligence was in the culture, not in the brain or AI.