Hello. I went to register all of my Titleist clubs. I noticed that the numbers on the hosel of my 910Fd and my 910H were the same. I figured it was because I ordered those two clubs at the same time. However, my 4 Vokey SM4 wedges all have different numbers then one another (serial number is on a sticker on the shaft instead of hosel). Why are the serial numbers the same on my 3 wood and hybrid but different on my wedges? Does Titleist save the specs through these serial numbers? Thank you!