perhaps also hybrids? The Census lists A. dealbata × Acacia parramattensis but I'm suspicious there might be more hybrids among bipinnate wattle species....
I agree it is A. parramattensis, because the number of pairs of pinnae is below the range given for A. mearnsii. Seems both species are very variable in appearance of foliage and placement of glands, and overlap in range for everything.
I don't agree, look at the pic of the leaf at https://apps.lucidcentral.org/plants_se_nsw/text/entities/acacia_mearnsii.htm. It is just like this one, and differs from the corresponding one for A. parramattensis. I will just have to go a pick a leaf or two and look for hairs on the leaflets.