I'd known about this case but never listened to the Taurus intro. It appears to be the same descending progression. I can see how this may seem like stolen or copied, but that progression isn't exactly unique. I guarantee that people fiddling around with their instrument are bound to come up with the same progression. Coincidentally, about half the open E progressions in 70s hard rock music are about the same, with small variations. If you listen to one Purple record, and maybe a Rainbow record, you'll hear those same guitar riffs in most records put out in that decade.