I don't know much about OCD, but the "getting stuck" doesn't seem to have a motor component to it -- so it's not about the motoric aspect of transitioning into the next task, it is getting stuck to meet a perceived psychological need (that might not be a great way to explain it, I'm not a psychologist). Stuttering is "getting stuck" at the motor or lexical level. (movement or language). So, I don't think that stuttering and OCD are directly related. That being said, a brief google scholar search indicates that both stuttering and OCD are associated with basal gangliar dysfunction (deep region in the brain). So, .... perhaps they are. But a note of caution. When looking at brain data from adults you can never tell if the brain difference caused the behavioral difference or if the behavioral difference caused the brain difference. So, it might just be that both stuttering and OCD involve getting stuck that causes the striatal dysfuction (which makes sense because the striatum is part of the basal ganglia that allows the rest of the brain to initiate things). I didn't read any of those OCD papers, only their titles. But I know the neurophysiology literature in stuttering quite well. So, take that as you will.