So looking at This Job and under "Your Checklist" it has 3 different uploads, Cover Letter, Resume and Statements addressing the Key Selection Criteria
now to my understanding the Statements addressing the Key Selection Criteria is the Cover Letter and a well written Cover Letter explains how you fit with what the employer is looking for.
So what is the difference? and how do i write Statements addressing the Key Selection Criteria in general (using the link above as an example)
NOTE: i am not applying for the job linked above as it is too far away however i figured i should get this cleared up in case if i veer come across it again