I was reading the information kindly provided by
@CB91710, and it says that Spanish Cedar is softer and lighter than true SA mahogany. I have a guitar made from that wood, and I love it. [Both the guitar and the wood it's made from]. I've noticed the stripes in "African mahogany" backs before, and would assume that is Sapele. I had an Epi Elitist SG for a long time, and it was made of what I guess was Sapele. It was also painted with Poly, not nitro. But it was a great guitar, sounded and played the same as any good Gibson SG.
I have to admit, though, that I love the look and feel of true SA hog. It's traditional, and that's very comforting. You know you're getting the original stuff.