I can't explain the differences that you have posted. It is possible that there were two different families involved here. It could be that Ebenezer married twice:once to Thankful and once to Abigail Rockwod. I certainly have no vested interest in clinging to the information that I posted since I am not at all sure that my family is in any way connected to this New Hampshire family.
I also note, however, that your source is from someone's research - ie, a genealogy written by someone who may be right or may not be right. The information that I posted was from Winchester records of births and marriages. I believe the latter is considered primary evidence and the former is always suspect.
Ultimately, however, what I want to know is if any of these Alexanders from Winchester eventually moved south into Pennsylvania. If so, who and when.