Taken from: http://socion.info/quasiidentical.html

A clear explanation of the relations of Quasi-identical
By Reuben McNew [ENTp]

In most aspects, Quasi-identical relations resemble Mirror relations in many ways; just like Mirror relations, the partners sources of confidence and the creative abilities switch among them, causing them to each see half and half of an idea or story. However, a few key aspects do differentiate the relations from one another, as follows.

When partners first meet, it does not take long for Quasi-identicals to notice the many similarities in the way that they think and feel. However, even though Quasi-identicals may feel that close connection, their own cherished sources of confidence and creative avenues may relate to each other more like distant cousins than they do closer kin, and may seem a tad foreign in behavior. In result, partners may unexpectedly become confused and misunderstand the view and ideas of the other; even with totally familiar topics, each may have little idea where the other partner is coming from with his or her logic. Sometimes partners may even find themselves in heated arguments and power struggles over simple things of minor importance, like proper procedures or personal preferences. For the most part, this should be expected behavior between partners, and they usually do not lose much sleep over it; especially if they are on even grounds in intelligence and can relate well to each other.

Even with their problems, Quasi-identical partners do not make natural enemies, and typically remain generally harmless to one another; where each partner is weak and vulnerable, the other partner remains innately indifferent and unconcerned. In result, it is rare to find one partner to ever unintentionally threaten the soft and vulnerable area of the other; however, partners may at times notice their own general dissimilarities and make good note of them for whatever purpose. Sometimes a quasi-identical may even criticize the other partner in terms of a minor weakness, and could appear controlling or irritating to the other partner; though, it usually does not disturb the partner enough to retaliate much unless the criticism is touchy and constant. Usually, partners still manage to co-exist well enough with their own minor differences and strengths and weaknesses in behavior.

If they are thinking types, Quasi-identicals usually become close friends and companions, even with their disagreements; even so, feeling types may find themselves increasingly irritated with each others illogical behaviors, as their feelings increase the tendency for confusions and misunderstandings among them. Yet, when this relationship fails, it fails. In all, Quasi-identical relations are among the better type match relationships, and could be used as a basis for romantic interest as well as for friendships taking the partners can see through their subtle differences and an intimate relationship develops in result.