With two flowers, this can't be C. fuscata, which only ever has one. The pale colour on the outside of the unopened flower also points to it being C. carnea.
This and your C. ustulata sightings are the first reports of these species for the season. It's good to know they're out there. I went looking for both in likely places in Aranda Bushland yesterday and couldn't find either - it's horribly dry!