四分律行事鈔資持記 2.358

2.358

四一一互者。此與當分不同，如佛一種，當分乃對餘佛明之，此門即就一佛自辨。

Regarding "the fourth, mutual interchange between single entities": this is different from within the proper category; for example, regarding the single category of the Buddha, within the proper category it is explained relative to other Buddhas, whereas this section discriminates within the single Buddha himself.