I have almost exclusively grown chems diesels and ogs since I started 3 years ago and I am certain from my experience with a pack of nycd that they are not related. pack states its a Mexican sativa x afghani and it def reminds me of the Mexican sativas I grew up smoking. I have heard that Soma lost the nycd parent clone to a bust before he moved to Spain but current seedstock is supposedly made from selections within the stock he had left so its not like it changed. The real deal diesel and ecsd are def all over NY both the city and upstate that is where I first ran into and fell in love with it. Supposedly chem took the clone there and people started calling it nycd. U probly have a diesel cross IMHO and I personally would be happier it is the more powerful of the two from my experiences. The truth is that there is a lot of bs and hearsay aned what I have said is what I personally choose to believe after doing quite a bit of research and growing in this family.