I think so, I know the difference because when I'm thinking logically I can tell myself there's only a small percentage that would happen, etc. When it's a delusion I can't be convinced that it isn't true, even by other people (therapists, doctors) it takes up my whole life and I'm paranoid and there's usually other stuff going on like hallucinations and symptoms of psychosis but that's because of the sza disorder. A doctor would be the best person to ask about this, they can tell whether you're delusional or not.