Ok... nitpick.
Dark Carnival and Carnival actually had a name change. Lyrics have changed. She changed the name. Same thing with Interlude and ATM. You can think of this as the song being worked on, and the other forms weren't quite finished.
However,
or is it just 'Carnival' ...but...like a different version(you know, like "devide and conquer&ordinary day")
She never changed the name of that song. It has always been "Ordinary Day." The fans have appended the "(Divide & Conquer)" to the name to distinguish that version from the final album version. So, you would properly refer to the songs as "Ordinary Day (Divide & Conquer [Version])" and "Ordinary Day" respectivly.
Sorry, it's a pet peeve of mine.