So am I underatanding this right?
Two Batman movies, both based on the comics and having the Joker are simoiar because ...
They both have the bat light?
have Alfred?
have Batman?
Have the Joker?
Have the Joker's playing cards?
Have females? Not the same characters might I add
Have Batman looking at the Bat computer?
Have the Joker smiling?
You could have compared the 1960's Batman tv show episodes containing the Joker and came away with the same comparison.