No, these substances are quite different. If you look up “delta 11 THC” in a search engine, you’ll be bombarded with results for a THC metabolite called 11-hydroxy-THC, which is not the same thing as the natural phytocannabinoid delta-11 THC. It’s well-known in the field of cannabis pharmacokinetics that delta-9 THC metabolizes into 11-hydroxy-THC in the body, serving as a middleman as this cannabinoid is further transformed into 11-nor-9-carboxy-THC, also known as THC COOH.