Going back to your comment about European Oak versus American White Oak, it illustrates one of the key points about timber identification.
Most people who are experienced with Oak can take an educated guess at distinguishing between these two types of Oak, American Oak tends to be paler and doesn't have that straw colour that European Oak has, it tends to be straighter grained and a bit blander, it also has lower tannin levels which some people say make it smell differently (although personally I can't smell any difference).
But here's the thing. Could you, with 100% confidence, say any individual board of Oak is definitely European or definitely American? Not really, Europe and America are both big places with a huge diversity of soils and climates, it's no surprise that there's a fair overlap of characteristics between these two different Oaks.
I believe that Holland has the tallest people in Europe and Malta has the shortest, but there are still plenty of tall Maltese people and plenty of short Dutch people. It's the same with trees, you generally have to accept that you're working with probabilities rather than absolutes.