Hydraulic Pump Cross Reference

Does anyone know of a source that could provide insight into which pump is in which excavator?

I am currently working with a JD 470GLC and there appear to be many pump options:

(not the serial number range I am working with)
SNs PIN: 1FF470GX_ _C047001-
--Pump PN 9184686EX

(I am working with this serial number range machine)
SNs PIN: 1FF470GX_ _E470001-
--Pump PN FYA00035147 or FYA00052949 or 4699645 or PG202165
then to confuse things more Alibaba references these numbers for the...

Hydraulic Pump Cross Reference