瑜伽師地論略纂 1.122

1.122

五趣四生，《成唯識》說皆以異熟為體，或并五蘊，唯異熟無記性趣。言種果者，謂異熟果及名言種。并彼業者，順趣故，體非趣。若不爾者，相雜起故。廣如彼論。

Regarding the five destinies and four modes of birth, the Cheng weishi lun states that all have vipāka as their essence, or include the five aggregates, being solely destinies of vipāka-indeterminate nature. Speaking of "seeds and fruits" refers to the fruit of vipāka and nominal seeds. Including those karmas means they accord with the destinies, but their essence is not the destiny itself. If it were not so, they would arise in mutual confusion. This is detailed as in that treatise.