Well, just to clarify, the King Cobra isn't one of the "Spitting" species. There are many different snakes that can do so however. Some of them, as per "Manbir-online.com", are the African ringhal cobra, (Hemachatus haemachatus) , and the second includes the black-necked cobra (Naja nigricollis), the Mozambique spitting cobra (N . mossambica) , the Mozambique red spitting cobra (N . pallida) , and the wEst African spitting cobra (N . katiensis).
The third group is from eastern Asia and includes the golden spitting cobra (Naja sumatrana) of the Malay Peninsula and Sumatra, the Indonesian spitting cobra (N . sputatrix) of southern Indonesia, the common spiting cobra (N . philippinensis) and Samar spitting cobra (N . samarensis) of the Philippines, the Chinese and Indochinese populations of the Asian black cobra (N . atra), and some populations of the widespread Asian monocled cobra (N . kaouthia).
Aside from the cobra genus, there is a type of pit-viper that can "spit" it's venom. Trimeresurus mangshanensis, more commonly known as the Mangshan pit-viper, is a venomous pit-viper species endemic to Hunan province in China. It is reputed to be the only non-cobra known to spit venom. No subspecies are currently recognized.