Pinks and purples are very common within the scale patterns of some boas.
This is my "normal", actually a pure locality from Barranquilla Colombia.
He was younger in the above photo, which is when the colors tend to peak. The pink/purple color tones are evident in this picture.
A more recent photo shows an increase in speckling and brownish tones taking hold.
My point is pinks/purples do not make a morph. They do however make a beautiful boa.