 Sometimes it appears that identity is relative, when in fact ambiguity of reference is present. We might say that George and I took the same bus, meaning that we both took a bus on route #56. Or you might say of the same events that we took different buses, because I took the #56 at 10:25 and George took one at 12:30. But these are not conflicting identity statements about the same things. The first concerns sameness of bus routes, while the second concerns time specific instances of the route. 