As to the names being confusing - for me, too!
If my tiny amount of reading has steered me right, every variety is almost a clone and propagates by spreading or division until every member of that clone, all over the world, 10 to 100 years later depending on variety, flowers seeds and dies within a year or two of each other. Then each seedling becomes a new clone.
With kind of life cycle, how would you test for "same species" in the sense of "capable of pollinating each other"? Wait several decades until it flowers and dies? Then you would only know retroactively.