Hi All,
I would like to copy one list to another without the changes done in one list impacting the other.
Basically I will have 2 lists. One holds the initial values and the other list which will be changed on visualforce page.
At the end I want to compare the changes between the lists.

I tried the following ways to copy the list (addAll,Clone,and assignment,for loop). In all cases the if I change one list the other list is also changing its values.
Refer the below code snippet. When the accountList changes the initialAccountList also changes.

Visualforce Page:
<apex:page controller="ListCopyController">
  <apex:form >
  <apex:pageblock title="Accounts List Copy" id="pgblkId">
  <apex:pageBlockTable value="{!accountList}" var="acc">
  <apex:column headerValue="Name">
  <apex:inputField value="{!acc.name}"/>
  </apex:column>
  <apex:column headerValue="Rating">
  <apex:inputField value="{!acc.rating}"/>
  </apex:column>  
  </apex:pageBlockTable>
  <apex:pageblockButtons >
   <apex:commandButton value="FetchAccounts" action="{!fetchAccounts}" reRender="pgblkId"/>
  <apex:commandButton value="Save" action="{!save}" reRender=""/>
  </apex:pageblockButtons>
  </apex:pageblock>
  </apex:form>
</apex:page>


Apex Controller:
public class ListCopyController {

    public list<account> accountList{get;set;}
    public list<account> initialAccountList{get;set;}
    
    public ListCopyController(){
        accountList = new list<account>();
        initialAccountList = new list<account>();        
        
    }
    public void fetchAccounts(){
        accountList = [select id,name,rating from account limit 5];

        for(account acc: accountList){
            initialAccountList.add(acc);
        }
       // initialAccountList = accountList;
       // initialAccountList.addAll(accountList);
        //initialAccountList = accountList.clone();    
    }
    public void save(){
        system.debug('@@ initialAccountList'+ initialAccountList);
        system.debug('@@ accountList'+ accountList);
        update accountList;
    }

}

Looks simple but couldn't find anything relevant while searching.
Any pointers/suggestions are highly appreciated.
Many Thanks!