Quote:
Asperger’s and Autism share primarily the difficulty of recognizing the existence of others—trouble with theory of mind. Asperger’s can talk; autism usually has limited speech.
Asperger’s children appear less interested in forming bonds and have more trouble with “theory of mind” than NVLD and Sematic-Pragmatic Disorder.
NVLDs are marked by integration problems of pragmatic language gestalt; spatial orientation; and motoric coordination.
Taken from
here.
People with NVLD have problems with pragmatic language, which in turn is why they have difficulties with socialization; those with AS and Autism have problems with pragmatic language (Autism has semantic too), plus a lack of empathy/theory of mind (i.e., recognizing that people are "real" and distinct from their own thought processes), which in turn equates to a greater level of social impairment.
Those with NVLD have stereotyped interests, they're just not as all-encompassing as those with AS or Autism.
NVLD also has marked deficits in spatial knowledge in comparison to those with AS.
It's possible to have both conditions. Just like it's possible to have an auditory processing disorder without AS (the former is a part of the latter).