According to the parts book the RC and RD do share the same rear brake hose, however the Australian bikes use a different part to the rest of the world. I believe I’m correct in saying from 1982 the rest of the world had braided brake line fitted to 1100R’s where Australian bikes continued with rubber lines.
43310-MA3-641 Rest of the world
I have measured my RD braided brake line, maybe this will help:
Complete hose measured from centre of banjo fittings 46cm. The banjo fittings are 90 Degrees twisted.
Long banjo fitting caliper end 4cm
Hose protector 14.8cm
Short banjo fitting 2.2cm
When I replaced the lines on my RB I used black plastic coated stainless lines this keeps the original look but with stainless lines.