Gee heralde, figured at least you of all people would know what I mean, what with your worldiness and all.
I mean, you can have things in common, such as characteristics, traits, quirks, etc, but not like the same things, such as a certain TV show or certain genre of entertainment, etc; likewise, you can like the exact same things, but be as different as night and day when it comes to personality.
Personally, I think a relationship would probably stand a better chance at surviing if you share similar interests as opposed to haing things in common... at least, those qualities seem to be more important to most superficial people.