Can i see the back of its head i can give you some pictures of Australians and new guineas to compare. in my opinion he he looks kinda NG
NG baby
https://ibb.co/drn0k9f
Hybrid female
https://ibb.co/Bw5Qy9Q
Male Aussie
https://ibb.co/hL9cX22
Baby Aussie
https://ibb.co/c8QvX7C
Hybrid Female
https://ibb.co/YyMmbg4
Hybrid female again
https://ibb.co/Yj0nbDy
Aussie male (northern Territory)
https://ibb.co/j5pYrTz
Aussie male
https://ibb.co/PNTWXhZ
hybrid male
https://ibb.co/NZJ5KpS
In my opinion i think you have a NG. cant really tell the sex but judging by the frill probably a female. i left some pictures that you can compare to mine. A good identifier is aussies have bright white cheeks as you can see in the male pic 2nd and 3rd from the bottom. you can also see in the 3rd pic at the top. hope this helps!