On the processorfinder there are different package types and I don't understand the difference or find something that would explain the different name:

P4's:
FC-PGA2-478-pin
478 pin PPGA
478 pin PPGA FC-PGA2

775 pin LGA
775 pin PLGA

P-M dothan's:
478 pin PPGA
479 pin H-PBGA

(dothan is supposed to be 479 pin but my dothan is 478pin package type )



Can someone explain to me what I am missing here?