Is there any difference between harry's wand and voldemort's wand?

Well the wand that Voldemorte has been using shares the same core. That means that the magical part of it came from the same creature. In this case the Phoenix Fawkes. However, with the disappearance of Olivander, it is entirely possible that Voldemorte has a new wand, since the one he has been using can not be used against Harry's. The wands simply misbehave.