俱舍論疏 6.289

6.289

論「此果但由至乃名同類」，答也。言「等流果似自因」者，但麁相說，以同是染、同一地故名為相似，非是五部體類亦同名為相似。若體同名同，同類因。

The Śāstra states: "This fruition only by reason of [...] then it is called 'of similar kind'." This is the reply. Saying that "the outflowing fruition resembles its own cause" is spoken only in a gross sense, in that being alike in defilement and alike in plane (bhūmi) is termed 'resembling', not that their entities and categories among the five categories (pañcaprakāra) are also identical and termed 'resembling'. If the entity is identical, it is named a cause of similar kind.