:old.clob and :new.clob in triggers

I've a table with a clob column. In a trigger that I need to write, I need to compare the old and new values for this column.

The code inside the trigger body looks like this:

CREATE OR REPLACE TRIGGER tr_clob_test AFTER INSERT OR UPDATE OR DELETE
   ON tbl_clob
   REFERENCING NEW AS NEW OLD AS OLD
   FOR EACH ROW IF UPDATING THEN

	IF :NEW.clob_col <> :OLD.clob_col
	THEN
		INSERT INTO ...
	END IF;

END;
/

Is this the right way of comparing the old and new values for a clob, inside the trigger? Please suggest.

--
Thanks
DeB