This thread is reason I like go by scientific name, because it say what exactly you have. It is like your mate, he say I got a new Nike shoe, 2012 model. Oh and I do too, but mine not have this type of sole, but it is same model. Well, one is really just a fake with same name, other is real deal. Same with wood, seller will get wood, cut it and its having dark heart wood, mulberry. Its a red mulberry, please buy.
Though really the wood is Morus bombycis he is selling it as Morus Rubra, one is Asian variety and other is North American Species. So, even you buy it thinking it is Red Mulberry it is not, and may have lesser working properties or better, and confuse everyone.
However it is difficult to always identify wood to its scientific name, I think it would be really helpful. For many year I was using a wood I was told was white mulberry because no heartwood, but it is really a Japanese Hackberry wood.