My kid took AP Calc and HL, they aren’t duplicative. I don’t think an HL student could pass the AP exam and vice versa. HL teaches more than Calc and the Calc it does teach it approaches from a different angle.
Editing to note that my kid took 1 year of HL and 1 year of APBC. Maybe students who take to 2 years of HL could pass, not familiar with that route.