Only in the very technical, abstract sense. Interrogations, testimony and memories are about psychology, what has actually happened is only superficially relate

Only in the very technical, abstract sense. Interrogations, testimony and memories are about psychology, what has actually happened is only superficially related. When you have a long conversation with someone, it's easy for them to remember things you didn't say because they think they heard them. Watch the video linked above, for the example about the story the guy read to the audience. This is exactly what happens to everybody - I myself thought I was smarter than that, but I'm really stupid and stubborn like that and it took me at least 10 times being proven wrong before I internalized that no, the things I think I see and hear and remember are quite likely to be different from what actually happened (in criminal psychology and evidence classes, this was). Anyway yes it's easier to change a conversation than to fabricate one; because "changing" can mean many things - intentionally lying is the least common occurrence, simple "neural" errors happen a lot more often.