Congenerical is a term that means having the same or similar ancestry or origin. There are several synonyms that can be used to describe a similar concept. One synonym could be consanguineous, which refers to having the same bloodline or being of the same family. Another synonym might be kindred, which refers to being related or having a similar nature or origin. Conversely, if one wants to convey the idea of a lack of similarity or a divergence in ancestry, they might choose a synonym like dissimilar or unrelated. Ultimately, the synonym used will depend on the specific context and desired connotation.