Is there a difference between the apple store id password and apple iTunes store password?

I know my apple id password. When I try to log into my apple tv, it asks for my apple iTunes store password and when I enter my apple store password, it is rejected. I tried to change my apple iTunes store password to the same as my apple id password and it says I have previously used that password which leads me to believe they are the same but then why does apple tv not accept it?