[Relambrien]

Actually, if they were -EXACTLY- the same, then they would make the same decisions. If they didn't, then they aren't exactly the same.

Note that two people being exactly the same is more or less impossible naturally, so the whole thing is irrelevant to reality anyway. However, I believe that eventually, provided enough information about the person, psychologists will be able to tell you which sort of actions you could be predisposed to take, but nothing specific. Only general things like "You probably choose to avoid conflict than to involve yourself in it." They can already pretty much, but only through analysis of behavior rather than of the brain. I think we'll eventually learn enough about the brain to make these same conclusions without having to do behavioral analysis. This avoids the pitfall of people not accurately conveying their situations to their psychologists.

Seriously though, I think that's as far as we'll be able to get in terms of "reading minds" for a long while.