If you are confused then you are in good company ,Graham Stuart Thomas was also confused. He writes that many  horticulturists in the early days,labeled musk rose or rosa moschata incorrectly  when they was describing rosa brunonii and rosa dupontii. The original musk rose was a native of the Pyrnees but has long been lost to cultivation. A variety can be found in England . One of the features of this rose in defining whether or not it is a true musk, is when it blooms. Apparently musk roses only bloom at the end of summer and into autumn. The only other rose blooming then is the Autumn Damask. So all that said, it looks like it depends where the rose originated and therefore could be much hardier than I said. I bow my head in humility.