#allSendersOf:inPackageNamed: vs. #allCallsOn:localToPackage:

In SystemNavigation, what is the difference between
#allSendersOf:inPackageNamed: and
#allCallsOn:localToPackage:
?

Is there a reason to prefer one over the other, when looking for senders of a specific message in a specific package?

And why is the word „calls" used? I was proud to have learned from the Pharo book that there are no calls, but only message sends?