There's actually a range of Hawaiian music formats. Hawaiian AC plays a lot of gold acts like 1970s supergroups Cecilo & Kapono and Kalapana, as well as softer-edged contemporary acts like the late Israel Kamakawiwo'ole and Keali'i Reichel. Hawaiian CHRs, meanwhile, play younger-skewing acts, mostly from the world of Hawaiian Reggae. Check out the websites of those stations you mention for more details.