I'm not sure what this thread is about at the moment.
But if the question is whether there are visible differences between negatives of various films, then I would have to say yes of course!
How big or important these differences are depend on your personal view. Something that looks almost the same to one person may appear radically different to another. It depends on what details you pay attention to, if any.
If anything these differences will be more apparent in a sccan than a print. In the print you have an overlay of other factors, which affect the look.
Personally, I have no trouble telling my films apart based on scans with no identifying marks.