This weekend there was a fly in and chili feast at a local grass strip (MD1). A whole bunch of us flew in. As you can see there was a great variety of aircraft on the field. And although the airplanes look a lot different from each other, when you get down to the engines and instruments , we all use the same parts from the same manufacturers. Although Cessna and Piper assemble them in different ways.
So the similarity with a storage network is there, the underlying bits and pieces all come from the same vendors. Hard drives, cards and so many other parts. But each of our diagrams is a little different.
Cross referencing parts can be interesting, but next time you are negotiating with your storage vendor ask them where they get the cards I'll bet it' s Intel and Qlogic. And the Hard drives are likely to be from Seagate.