Could be. However, the diagnostic of a very narrow base cannot be seen in this photo. http://worldwidewattle.com/imagegallery/image.php?p=0&l=p&id=3504&o=1
I have used this photo to mark what seems to be the eastern extent of the spread of A. pycnantha from the plantings made by Charles Weston at the top of Mt Mugga Mugga 90 years ago. I have reported others from this up the slope.