Hiro is a 14-year old robot designer from an unknown time, likely beginning-mid XXI century, around 50-100 years before the events that take place in Wall-E. And during the movie, something that looks like EVE's head can be seen on Hiro's desk:
Although as Paulie_D says in the chat, this could be just another easter egg in a movie full of them.
Is there any official confirmation from the makers that the cities are the same? Or if they both happen in the same universe?
I am not looking for the city in which San Fransokyo/Wall-E are based on in real life. What I want to know is if, within Disney universe, Wall-E's city is San Fransokyo.