Wence the Wanderer
“Limit one Hero per zone”
If a player has a copy of a Hero in play, he cannot play, take control of, move, or put into play (via a card effect) another Hero into that zone. His opponent also cannot play, give control of, move, or put into play (via a card effect) another Hero into that zone.
I see no word referring to 'corresponding' zones. It's just referring to the one player's zones as I read it.
I'm inclined to agree. What you may be reading is a note about things like forced march, meaning no one can move two heroes into the same zone. the word 'corresponding' is the most important defining factor.