The standards between new zealand and the usa or most other coubtries does not exist, therefore you have to get each qualification evaluated for equivalency.
One such agency is naces, here is a link to them, there are some others too.
https://www.naces.org/?_aiid=12167
But if its just a fine arts degree do you really need it to be evaluated? Unless yoire trying to get admitted to a masters why bother? Its a bit different in medicine or engineering or law where its essential those qualifications match.