Yes, and no. It's not a simple cut-and-dried answer. I am saying they are on an equal playing field, but are not equal in design and function. In some ways yes, in some ways no. In BC, yes, in velocity, no, in KE, no. But at some point on the grid their paths cross...Where that point is, is what has me curious. Does it happen at 500? 600? 750? 875? 1000? Beyond?
I used to think book data was really important, but the more years go by, the more I realize they are nothing more than a very basic guide to get you started, and not to be taken too literally, especially since every rifle, every brand of brass, and every powder, primer, and bullet lot is different, and won't always be the exact same as what they used to test loads for their manual's data.