I will leave this to Americans, but from my Australian chair it seems
One is a foundling "Frazer's Pink Musk"
And the other was the real thing 'Fraser's Pink Musk'.

The reference in the foundling "Frazer's Pink Musk" has some mis-spellings and I think they should have been written as (my suggestions in caps):

p40. Photo. Gregg Lowery: "Frazer's Pink Musk". Found in South Carolina, USA, and displayed at The Huntington Botanical Gardens, circa 1980. While this may yet prove to be identical with the Noisette called "Lingo Musk", the genetic study seems to indicate that the two are not identical. In the 1980s this rose grew in The Huntington Botanical gardens, and was believed to be the rose raised by the Charleston botanist and nurseryman John Frazer FRASER , a contemporary of Philippe Noisette and John Champneys. This tall, broad plant can send up canes of 7 to 8 feet in late summer and autumn, each of which finishes in a great panicle of flowers. The blooms are small, an inch or so across, rosy pink to blush, with a sweet, musky scent.

p41 ibid. Rosarian Leonie Bell ordered it ["Lingo Musk"], grew it, and suspected it to be the long lost "Frazer's Pink Musk". 'FRASER'S PINK MUSK'. It is uncertain whether this plant is distinct from the "Frazer's Pink Musk" that was grown at The Huntington Botanical gardens; however, the genetic study portion of the Hampton Park Noisette Study seems to indicate that they are different.