All of the Celestes that were tested at USDA / UC Davis were the same by DNA.
There were about a dozen and a half samples (Celeste and Blue Celeste), which included a 2 or 3 that were labeled as Celeste but were something else (which provided some "control" in the testing). But well over a dozen that were "genuine" and all the same by DNA. The original plan was to test the DNA and match the variations in color, size, taste, etc. to the variations in DNA. There were no variations evident from the DNA tests, but there continues to be quite a variability in the actual fruit, and their leaves.
Bass's Celestes are not real similar to mine, but I have seen some that were close to his, on my trees, at times, and have no doubt that his are really Celeste. The colors vary quite a bit from very red, to light pink, to something I can only call red-gray. Some are juicier, and some are drier and more concentrated. Some are larger, some smaller, some long necked, tear-drop shaped, round, short necked, etc.