Update Party level address in R12

How can I update party level address in Customer Master in R12? Customer has addresses in hz_cust_acct_sites and hz_party_sites, whenever I try to update from customer Master , it only updates the hz_cust_acct_sites. Could you tell me where or how can I update address in hz_party_sites , to change party level primary address?

What is identifying address and how is it different from Primary address?

Thanks