The following examples from Wikipedia illustrate what is "passive participle"
The bus has gone. (Here gone is an active past participle).
ex_1: The window was broken with a rock. (Here broken is a passive past participle)
Cambridge Dictionary gives these examples
Cambridge University Press published this book. (active)
ex_2: This book was published by Cambridge University Press. (passive)
I can't see the difference between ex_1 and ex_2.
Are "passive participle" and " Passive voice" the same?