Moshe Blatt son of Jacob - Who did he marry?

The marriage document I shared last week was written in Old Russian. I received the below information from a translator:

• Międzyrzec [Podlaski], Jul 25 1885, 6 p.m.
• Witnesses: Sucher Rozencwejg (Isokher Rosenzweig), 57 yo, and Izrail (Isroel) Pizmanter, 36 yo, both Międzyrzec dwellers
• religious ceremony was at 5 p.m., same day
• groom: Moszko Jankiel (Moyshe Yakev) Blatyta, Łosice dweller, bachelor, 22 yo, son of Jankiel and Perla alive, spouses Blatyta who live in Łosice
• bride: Chaja Bejla (Khaye Beyle) Boksern, Międzyrzec dweller, maiden, 16 yo, daughter of Chaim Erma (Khayem Irmye) and Ruchla Leja (Rokhl Leye) alive, spouses Boksern, she's living with her parents

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• So, are these my second great grandparents? A very good question.

I do know (from his tombstone) that my second great grandfather, Moshe (Morris) Blatt, was the son of a Yacov Blatt. (Yankiel is a Yiddish diminutive for Jacob). He is said to have been from Łosice.  Family lore also stated my second great grandmother was named Belle (or Bela) Wyman. When another Blatt/Blatyta researcher sent me their research several years ago, all I knew was what was in the Polish archives index, which didn't include the details above. One of Moshe Blatt's granddaughters recalled being told that her grandmother had a prior marriage. So it was reasonable to conclude that Belle Wyman could have married a Boksern before marrying my second great grandfather. But the details of the marriage document specify Chaia Beila Boksern was a 16 year old, and not previously married.

• So could family lore be wrong about her surname?

My second great grandmother died in Poland. One of my second great grandfather's daughters married someone with the surname Wyman. There were family jokes about the possibility of his relationship to his deceased mother-in-law. And there weren't enough generations lapsing inbetween for much confusion. Surely Morris would have told his daughters the correct surname of their deceased mother?

• Might there have been two Moshe Blatts, sons of Yacov Blatt, who married a woman named Belle/Bela, living in Losice? Sure.

My second great grandfather's death certificate states his date of birth was Sept 9, 1864. Informant, his second wife. Polish archives states Moshe Blatt, son of Yankiel and Perla, was born on May 1, 1862.

This also raised questions previously, but dates of birth can move around. For example, I know that my great grandfather's sister, Nelly Newmark, has documented dates of birth for both March 1889, and December 25, 1886. Without a birth record, it's unclear which is accurate. (Though I lean towards the earlier school record of Dec 25, 1886)

• DNA tells me that I am related to the Blatyta family. In some fashion. So if they are separate people, my Moshe Blatt was related to that Moszko Blatyta. But I don't know how.