成唯識論演祕 6.720

6.720

此唯無漏。彼漏無漏，故有別也。或小熏禪而更造業。今但資業，故云不同。

This is purely uncontaminated. Theirs is both contaminated and uncontaminated, hence there is a distinction. Alternatively, in the Hīnayāna perfuming of dhyāna, they further create karma. Here, one merely sustains karma, hence it is said to be not alike.