I think what it means for Will to be “just like Hannibal” isn’t particularly that he has to become a mini Hannibal, rather it’s more blatant and perverted in that, Hannibal wants Will to kill and eat a human being, just like him.

This is basically like the rest of us sharing our favourite show/book with our friend hoping desperately that they’ll be into it too. Excluding the existential philosophical rants and psychic driving and framing them for the murders YOU committed, of course.