Kināyah and tajrīd have different definitions. In kināyah, the audience moves from a stated meaning to an associated or necessary meaning, while the literal meaning can in principle remain possible. In tajrīd, a second similar bearer is conceptually extracted from the bearer of a trait.
They can coincide when praise first establishes a trait allusively and then portrays its intensity by the extraction of another bearer of it.
In such an example, the person's generosity is recognized through an indirect pattern of conduct and heightened until a second generous figure seems to be drawn from his person.
Important qualification: Not every kināyah is tajrīd. An imagined second counterpart is still required.