The Marriage Act provides a minimum set of words that must be used in a Marriage Ceremony.  This does not limit you to only using those words, or even exactly those words. If you choose to use different vows they must though have the same effect as those in the Act.
Words to each other
“I call upon the persons here present to witness that I, A.B. (or C.D.), take thee, C.D. (or A.B.), to be my lawful wedded wife (or husband)”
Words by the Celebrant
“I am duly authorized by law to solemnize marriages according to law. “Before you are joined in marriage in my presence and in the presence of these witnesses, I am to remind you of the solemn and binding nature of the relationship into which you are now about to enter. “Marriage, according to law in Australia, is the union of a man and a woman to the exclusion of all others, voluntarily entered into for life.”