The third part deals with conformity, saying that, except for the differences resulting from the derivation, the essentially derived variety conforms to the initial variety in the expression of the essential characteristics.
This part seems to be a repetition of the first part, but the first part refers to retaining the essential characteristics and the second part refers to conformity, which is more precise.
In fact this part remains generic, because, as it was discussed during the Diplomatic conference, the assessment of conformity depends on the species, the structure of the varieties and the genetic variability available for the breeders.
The conformity is defined at the level of the phenotype of the essential characteristics, between the essentially derived variety and the initial variety, but the phenotypical conformity can rely on different genetic backgrounds. This point justifies the existence of parts 1 and 3 in the definition.