"Sumac (/ˈsjuːm?k/ or /ˈʃuːm?k/; also spelled sumach) is any one of about 35 species of flowering plants in the genus Rhus and related genera, in the family Anacardiaceae. "--wikipedia
"oxicodendron vernix, commonly known as poison sumac, is a woody shrub or small tree growing to 9 m (30 ft) tall.[1][2] It was previously known as Rhus vernix. "--wikpedia
They are not related. I've never heard of getting honey from poison sumac. Sumac makes a very nice honey and a nice tea and good smoker fuel and nice pipstems as the center of the wood is pithy and can be pushed out or burned out easily.