1.Both have that character role where in involves kids with very special attributes.
2. Both have the same scenario where kids found themselves in another world.
3. Have that same plot where kids were able to prove themselves as not to be trifle with.
1. Kids in one anime were very adept in using magic and fighting that they can take down even the most powerful mage, while in the other anime them kids were very much a bunch of prodigies that had made a name for themselves at an early age.
2. Kids in one anime have to use their wits in order to not only survive in the alternate world they're in but also to thrive with the people they're with. The other anime, them kids allowed themselves to be transported to that the alternate world to simply escape the boredom in their world.