Understanding the apadanas

I’m doing a little talk on the 28 Buddhas chant popular in our local Sri Lankan temple.
A little comes from DN 14 & 32, but most of the references come from the apadanas and the buddhavamsa.

I was wondering about thee thre different numberings apparent in some of them. eg:
the Therapadana numbered 480 : SuttaCentral in suttacentral addresses, is listed thus:

475. {478.} Vallikāraphaladāyaka

480? 475? 478?
what do these three numbers refer to?
thank you

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