“ie no difference at all”
again, at least to me, it is very important to be rigorous in the use of language in the description of basic principles of the conduct of the universe.
It is, of course NOT “no difference at all” There will always be a difference, under all real circumstances.
What you mean to say is that in practical terms to humans, and according to our perceptions there is, in a practical sense, “no difference at all”
True, but the difference is so small and in practice so much smaller than so many other things that could effect your measurement that it can be ignored. Could you measure it if you wanted? Given a million dollars of equipment in a lab maybe (I’m not up to date on this kind of lab stuff).
In many cases you are happy to get a result to 1 part in a 1000, something that will change that by 1 part in 10^14, is so small that in practice it is ignored. Now there are times when it must be accounted for but one of the things you pick up along the route to a PhD is knowing how to design an experiment so that it will account for the correct things.