You don't have to have any knowledge of floors. You just have to have the basic ability to notice that the wood grain patterns are identical. If you can tell this....From this....
Then you have the qualifications necessary to verify whether or not two wood grain patterns are the same.
I am astonished that people don't seem to understand that no two natural wood grain floors will have the same identical pattern. It's like they don't know that people have different fingerprints, and that you will not easily mistake one for another. I hesitate to use the word "stupid" but I am having difficulty thinking of another explanation for such obstinate lack of understanding of this significant point.
Perhaps I spend too much time talking to Engineers and Doctors, but come on people! This ain't rocket science! Identical wood grain patterns do not exist independently! Variation in tree growth renders the chances of an identical pattern between one piece of floor and another a virtual impossibility! The fact that the photos and the floor share an identical pattern is absolute proof that it is the same floor! I can't believe I actually have to explain this. (Not to you, Exmil_UK, I think you are just joking.)
I am done for the night.