In fact, an interesting thing is that one's results can change over time. One's DNA is not different, rather an increased number of profiles allows for the inclusion of updated data. Today, I received an email notification of updates to my Ancestral Regions. The category called, England & Northwestern Europe dropped a lot because of the addition of additional European regions to my data.
We are all extremely unique and these DNA results are simply best-guess ranges. That new 1% from Sardinia probably doesn't mean anything. Yet, I find it amazing that the science is developing at such a rapid pace.