I think this particular phenomenon in Trump's pattern of neuroses (pl) can be more precisely stated: Trump has the relatively rare ability to honestly and truthfully "remember" a single past incident in which he was involved in multiple different ways. In other words, it is perfectly natural for him to describe that past incident TO HIMSELF as well as to others in different ways. He quite literally believes each different description is absolutely true; thus, since lying required knowing that what we says is false, The Donald is not lying when he does this. 

I happen to recognize this phenomenon quickly because my mother exhibited the same very rare condition. So to understand her (and thus to understand myself!) I had to grasp that from her perspective these diverse recollections of the same event were equally honest and true.

And then upon deeper analysis, one observes that the explanation of the different recollections is whatever today presents the one in the best light.