Just to be able to throw something in here, I'll post my starting sizes:
Pre-HRT:
nipple diameter - 1/4"
nipple projection - 1/16"
areola diameter (width) - 1" left, 1-1/8" right
As you can see, the right was slightly larger always. I don't know if it is coincidence then that the 'bigger sister' is the one that's been making more 'noise' than the other now that they are starting to respond to HRT. Perhaps she will get ahead and stay ahead but I'd really prefer to be even. They're both slightly sore only in the nipple right now and the right one is slightly firm like as if it was cold.