OMG this is kind of hilarious. But then again in the ways they are similar it is weird. Not to mention the guy ho plays Jace (Jamie Campbell Bower) played Grindenwald in the first and second part of the last Harry Potter films. So this is true but weird statement.
Pining this again! Jamie Campbell Bower actually did play both parts. He is Jace Herondale , decendent of William Owen Herondale, the third greatest badass Shadowhunter ever after Will and Jem as well as Grindelwald the weird European wand maker ! I just realized this like right now! I think they went into more detail on Jace in books then they did the other guy... Maybe because Jace is like the main characters boyfriend.