Sometimes two directories or folders can seem identical, at first glance everything coincides and it is an exact copy. But, to be 100% certain the best thing to do is use a tool like Directory Checker.
With Directory Checker you have a tool to check and compare two folders exhaustively, looking for possible differences. If any element is found to be different, it will be shown on the resulting list.
It isn`t just limited to comparing the filename, as Directory Checker also compares the version, the date of the last modification, the size, etc.