Usually you don't dx those two together, because of the way to big overlap. It's the same like schizoid PD and Asperger's. Some autistics are more obsessive than others.
I guess it's possibly to have both, but there is no way to tell correctly if the person just has many autistic routines or OCPD in addition.
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"I'm astounded by people who want to 'know' the universe when it's hard enough to find your way around Chinatown." - Woody Allen