大乘百法明門論開宗義決 1.87

1.87

若異屬果異即是熟者。既知異義亦在果上。熟唯在果。故異與熟二體無殊。異即是熟名為異熟。持業釋也。

Regarding "if 'different' belongs to the effect, the different is itself the maturation": Since we know that the meaning of "different" also applies to the effect, and maturation pertains solely to the effect, the two entities of "different" and "maturation" are not distinct. The different is itself the maturation, so it is called "different maturation" (vipāka)—a karmadhāraya compound (appositional).