No, you need to do a new listing on the other site. (US currency and different postage options etc.)

It's a little easier if you are using a listing tool such as turbo lister but if it's only the one, just do a seperate listing as suggested copy n paste.

I prefer a seperate one so I can change by relisting between the Aus and USA sites.

Sometimes I will list on both sites but only when I know it won't sell fast and I know I can cancel a listing quickly as soon as it's sold.