I can relate on the bipolar depression aspect however i have not been able to determine the differences on the depressions i feel, i do know there is differences in the way my depression effects me during different times.
Although i am not sure if any of this is Depression brought on by the Ocd that may be mixed in there as well as the only real thing i can notice with the OCD is often a sense of need to fulfill the rituals and Anxiety or frustration if not done properly or not able to do them at that time.