To expand on what stallzer is saying, stamps are considered to be the more common variety unless there is convincing evidence otherwise.
As ray.mac said, what exactly defines a Pigeon Blood Pink #64a is uncertain. Read Mike McClung here:
http://chronicle.uspcs.org/PDF/Chro...65/11568.pdfAs for the "bluish cast", reread the same author here where he asserts that the bluish cast is a normal characteristic of the true pink (#64, and if it exists and is definable, #64a):
http://chronicle.uspcs.org/PDF/Chro...44/10827.pdfThese and all other stamp shades just have not been quantified before. With time, the efforts of many will allow for measurable characteristics to be universally defined between expertisers and at least somewhat accessible to collectors.
Identifying shades across the Internet is impossible without color calibrated scanning and quantified characteristics agreed upon by expertisers. Even with these uncertainties, it is obvious to those who study these shades that both of yours would qualify as #65. I do like your stamp on piece though... Cheers!