Hi,
I am a seasoned HR professional, and I firmly believe that there is not much difference between the HR and marketing fields, except that marketing professionals tend to be more flamboyant. The "Guru Mantra" to be a successful marketing/HR professional is the same, i.e., "Customer Delight." From my perspective, the skills required in both of these professions are common, such as communication skills, listening skills, client management skills, empathy, research orientation, and the ability to manage clients' or employees' expectations.
HR professionals mainly deal with internal customers (employees), while marketing professionals deal with external customers (clients).
I hope this helps.
Good Luck!