Alan, I think you were making a mischievous quip, but I thought perhaps my comment deserved clarification anyway for anyone who read my post.
By my loose analogy of pigs having as much differences w/in a breed, as between breeds, I meant that there is about as much difference or variation of peaches on a given tree (from year to year, or climate to climate, or where it was picked on the tree, or how mature the fruit was when picked) as there is between different varieties).
Of course that’s not completely accurate if one counts that there are completely different types of peaches (i.e. a peach from a round variety will never become a flat peach (unless there was severe stink bug damage). But in terms of sugar content, size, shape, and color of the fruit and even age of the tree, I’ve observed vast differences of the within a given variety.
It seems to take me a few years with mature trees to really figure out if I like the peach, and do a fair evaluation for myself. And even then I find I am still making mistakes about varieties I thought were working good for me, or ones I wasn’t impressed with at first, but then warm up to.