ENFj and INTj. Regular socionics theory claims these types have a relationship that is very much akin to duality.

According to Taciturn/Narrator values theory, however, the relation is more similar to identicality. The two types share a Taciturn N function and this signifies a common mentality.

Related to this is the fact that the types INTj and ISTj have the capacity to dualize eachother via Taciturn N and Narrative S.

This is something to look out for.