Hmm well since I have both autism and severe PTSD, I know firsthand the sensory problems related to each disorder. I have to say from personal experience there are some similarities, but the two disorders present very differently. Sensory issues with autism are a constant, daily occurance that you simply must learn to live with, there is really nothing you can do to make it better other than avoiding things that cause sensory overload. However, with PTSD, avoidance is not a good idea if you are trying to heal. If you use exposure therapy, your sensory issues can actually get better with PTSD. Additionally, even when I was really ill with the PTSD I did have "breaks" where I felt less badly. I guess I'm basically saying that, with therapy and hard work, the sensory issues with PTSD can improve, but that's really not the case with autism. I would kind of liken it to asthma vs. emphysema. PTSD being asthma, autism being emphysema. Both are permanent conditions that cause problems with breathing, however asthma can be managed very well, emphysema can not.