The Identical relations are the relations between two people of the same type. They understand each other very well, because they see the world similar ( through the same aspects of the functions). This relations are great for self-searching. If one partner has more life experience than the other it would be very easy for him to pass his knowledge.
The problem of this relationships is that the partners are not able to help each other – everything that one is able to do is as easy for another, yet everything that is hard for one partner is just as hard for another.