(1) If—
(a) an act or omission is an offence against this Act and is also an offence against the Commonwealth Act; and
(b) the offender has been punished for the offence under the Commonwealth Act—
the offender is not liable to be punished for the offence under this Act.
(2) If a person has been ordered to pay a pecuniary penalty under the Commonwealth Act, the person is not liable to a pecuniary penalty under this Act in respect of the same conduct.