User blog comment:Uselessguy/Guess Plants or Zombies in the whole series/@comment-25154254-20140922104545/@comment-5792287-20140922105404

If it was Peashooter and Peashooter Zombie, the plant would be more likely to win. Same for Gatling Pea vs. Gatling Pea Zombie.

However, Wall-nut vs. Wall-nut Zombie or Tall-nut vs. Tall-nut Zombie, and the zombie would win as the plant can't attack.