This plant and one another came in a collection of Kunzera ericoides (white flowers, occurs frequently in the ACT) and Kunzea parviflora (beautiful violet flowers, but slow and delicate in the first year or 2). Do Kunzeas commonly cross breed like grevilleas?
There is a reference to Kunzea hybrids in a 2004 paper: Chromosome numbers in Kunzea (Myrtaceae) by P. J. de Lange and B. G. Murray in the Australian Journal of Botany 52(5) 609-617. The abstract is available online. I haven't seen the full article. There are also some papers by H.R.Toelken from 1996 and 2016 in the Journal of the Adelaide Botanic Gardens on the topic of Kunzea revisions - a google search using the terms Kunzea Revision will find them for you, it will also pick up a New Zealand paper from 2014 on Kunzea ericoides.
The Kunzea ericoides that I'm familiar with have much more linear shaped leaves but I suspect there is a lot of variability in growth form and leaf shapes across the geographical range of the species. Given this is a planted specimen its origin is unknown it could be K. ericoides but not a local ACT form.
Kunzea badjaensis was known in Canberra for years as the registered cultivar Kunzea ‘Badja Carpet’. https://www.anbg.gov.au/acra/descriptions/acc167.html I agree with Ken, the leaves do not look quite right, but I cannot think what else it could be.
The 2 plants have grown incredibly slowly and have had 3 years in drought since planted but since they may have a new name I will renew the guards around them