I agree there are differences between these two different ND conditions. You've pointed out some genuine differences. I'm certainly not saying they're identical. But there are also many similarities, like those I wrote about yesterday.
And the disability from My NPD isn't just a matter of how I treat others. My sense of self is... fundamentally artificial. I made Myself up, and I'm very aware of that fact, because I can change it without much effort, and other people can damage it without even meaning to. I don't feel like a real person. And I'm fine with that, but we live in a society where beings are expected to be real and to be people. My lack of artifice about My artificiality creeps people out.
I wish we lived in a society where everyone had NPD, because then social norms would be so much less effortful to Me, and I'd catch fewer ego injuries because people would know how to be sensitive about that stuff. Communicating with other NPD folks is easy in a way I don't experience with egotypicals. Communicating with autistic NPD folk is often effortless.