Hello! I have built a custom clone button on contacts to only clone certain fields and not others. One of the fields I would like to carry over to the new contact is Account Name. My issue is that when the Account Name is carried to the new contact, it overrides the contact's mailing address fields to reflect the address of the Account. This is not always the case, as not all contacts work at the main account headquarters. I would like the mailing address fields of the existing contact to transfer to the mailing address fields of the new contact, without being overridden when different from the account address. Here is what I have currently:

https://na8.salesforce.com/003/e?
&con4={!Account.Name}
&con19street={!Contact.MailingStreet}
&con19city={!Contact.MailingCity}
&con19state={!Contact.MailingState}
&con19zip={!Contact.MailingPostalCode}
&con19country={!Contact.MailingCountry}
&00NC0000004j5vK={!Contact.Status__c}
&00NC0000004jI0b={!Contact.Prospect_or_Client__c}
&con6={!Contact.Department}
&CF00NC0000005LWEw={!Contact.Advisor_Consultant_Group_Name__c}
&00NC0000004jI0C={!Contact.Functional_Role__c}
&00NC0000005PrMV={!Contact.Advisor_AUM__c}
&00NC0000004jF12={!Contact.Office_Main_Phone__c}
&con11={!Contact.Fax}
&00NC0000004j5Wt={!Contact.Website__c}
&00NC0000005L4Zg={!Contact.Sales_Territory__c}
&00NC0000005LJHn={!Contact.Trip_Planning_Codes__c}
&00NC0000004jF4V={!Contact.Pre_Merger_Firm__c}
&00NC0000004j5m3={!Contact.Branch_Id_Number__c}
&00NC0000004j5m8={!Contact.Broker_Number__c}
&RecordType={!Contact.RecordTypeId}

Any guidance would be very much appreciated! Thanks!