If the "concept" is "fights crime because of tragedy" then you are correct, as that is how Batman and Rorscach are alike.
Batman would never kill like Rorscach routinely kills, either. Ozymandias is rich, a genius/inventor, his body is in peak physical condition, he's studied all forms of fighting, he wears a cape, he goes behind the heroes' back to do what he thinks is best (like Batman has done with Brother Eye), has been dubbed the most dangerous man in the world, there's more in common there with Batman than there is Rorscach.
Nite Owl visually looks a little like Batman, has gadgets like Batman, invents things like Batman, has an underground hideout like Batman. Again, more in common with Batman than Rorscach.
Rorsacach fights crime because of a childhood tragedy. That's where the smiliarities end. He looks and acts nothing like Batman, even if they are both tough (most superheroes are). Thematically, Rorschach and Batman are similar, but that is it. Rorschach is hardly a "Zorro" archetype.
Rorschach is motivated to fight crime because of personal tragedy (initially, although this changes later on). That is where the similarities between he and Batman end, and what Moore was talking about. What would someone so hung up on a particular incident in their past like Batman has been written as having been sometimes, who is motivated to wear a costume of sorts and prowl around, be like in real life? Batman thematically.