Hi,
Sorry I missed this one. I am from the ACT and yes there is an equivalent Act. It is the Unit Titles (Management) Act 2011. Further information is available here: https://www.justice.act.gov.au/review/view/17/title/unit-titles
The Act itself is available here: https://www.legislation.act.gov.au/a/2011-41/
Quite a few details differ from NSW while many broad principles are pretty much the same.
I had to look up what s.65a does in NSW. In the ACT things are a little different. The things that seem to be covered by s.65a are spread out over several sections of the ACT Act.
A key difference is that in the ACT a unit owner can obtain a ‘minor use’ of the common property just with the approval of the EC subject to various conditions. We don’t need special resolutions and by-laws to enable a unit owner to do something relatively trivial. On the other hand something more major, say gaining exclusive use of a common property parking space and permission to build a carport over it, is a ‘special privilege’ and requires an unopposed resolution. So, depending on what you want to do, it is either easier or harder in the ACT than in NSW.
Was there something in particular you were interested in?