Harry and Ginny and James and Lily are widely considered 'basically the same people'. But Harry and James (looks aside) are nothing alike while Lily and Ginny (looks and personality) have nothing in common except they are both red heads.
But you know who are alike? Lemme tell ya.
Jocks with a love for playing, Incredibly social, All the girls/boys crush on them, Lots of friends, Crushed on one person for years, Master charmers, Popularity mostly due to looks, Hate to read, Can do magic very well but hate studying, Competive, Are slightly arrogant.
Did I just describe James or Ginny?
Love silence, Have bad relatives, Many people are jealous, Love to sit and think, Don't have many friends but have a few best friends, Are good at magic and don't mind learning, Are confused about their love life, Live and Love
Did I just describe Lily or Harry