Something being a complete work as opposed to a fragment doesn't say if it reflects the original. It is something that the scholars (several of whom were antagonistic to the idea of biblical inerrancy) have surmised.
Regardless, it is impossible to say for certainty that one thing was an addition and one was a subtraction. We don't have the originals so, you believe what you believe and I'll believe what I believe. Luke makes it a non-issue. She had a firstborn Son. His name was Jesus.
How does this tie in with the Protestant sola scriptura? It proclaims relativism! Relativism doe snot contain the Truth. Each man his own pope. NO wonder there are so many different Protestant "denominations."
At least we in the Aposotlic community of Churches know what the Church taught all along. We don't have to make up things as we go along. The Church preserved the word of God as it was understood 2,000 years ago.
Luke makes it a non-issue. She had a firstborn Son. His name was Jesus
Firsborn before all mankind. Eternal God. The Word. To Whom goes all the Glory.
I think we have beaten this dead horse long enough.