Below are my scenario:
I want to append the new rows to the table using the load replace.and if any existing data is there and the values are changed
in that need to update the values.what is the option i can use in load utility?

Any help

with load : only insert or replace
if insert-update is needed : import must be used and you need a pk
IMPORT

It make sence to do this , but until now there is no solusion do do it with load utility.
You can unload the current data and with syncsort to drop duplicates that are in the unload file.
Maybe now , after we have the MERGE , in the next version it will be posible.