abread111 the records of the euc trees I presented on CNM are all from young trees in the < 2m category in an area of about 20m2. Wikipedia on E. aggregata: "The leaves on young plants vary but are mostly elliptic to egg-shaped or broadly lance-shaped, 40–70 mm (2–3 in) long, 15–30 mm (0.6–1 in) wide and a slightly lighter shade of green on the lower side." See for instance my record Eucalyptus (genus) (A Gum Tree) with the 3rd photo of lower side. The group of 4 young possibly E aggregata trees occur about 100m south of mature (planted) and young (recruits) E aggregata trees, see for instance Eucalyptus aggregata (Black Gum) and https://canberra.naturemapr.org/sightings/4506260.
Don't think so, but maybe. Need to wait for buds etc - look at the time line for more of what seem to be the same species. E. aggregata : "The adult leaves are slightly curved and round-ended, about 12 cm long and 1 to 2 cm wide." From https://threatenedspecies.bionet.nsw.gov.au/profile?id=20128