I came across a reference in the Orange Botanic Gardens rose brochure.

orangeblossoms.orangemuseum.com.au/pages/designers/Roses_brochure.pdf

Under the rose R. sertata the description is

"This rose is often sold in Australia for R. setipoda, which is much better known and it could be, that all roses named after the latter in this country are in fact our subject rose; it was introduced in 1904. This species is said to be related to R. webbiana.

The rose has long arching, slender and spreading reddish brown growth that ages to a grey brown and with few to no prickles; it can be around 2metres high and spread to 4metres across. The foliage is quite delicate with small, mid green leaflets 5 to 9 to a stem, smooth and oval with paler reverse and up to 15mm long; the young leaves are often coppery and the stems are red with small reddish stipules. The lightly fragrant flowers are solitary, pale lilac pink with white centres around 40mm across, on short stems and with reddish stamens; the sepals are fairly long and retained on the small, red bottle shaped hips. The rose commences flowering in mid spring and can flower over an extended period. The rose is best grown by budding onto an appropriate understock."

which may explain things if the division is down to Australian pictures vs elsewhere.