The printed editions were the exact same Greek manuscripts as the manuscripts used;
That is simply not correct. Here are a few examples:
Luke 2:22 - Erasmus and Stephanus have “their purification,” while Beza, Elzevir, “her purification”
Luke 17:36 - Erasmus and the first three editions of Stephanus omit this verse, while Beza, Elzevir, and the 4th edition of Stephanus include it.
John 1:28 - Erasmus, Beza, Elzevir, and the 3rd and 4th editions of Stephanus have “Bethabara beyond Jordan,” while the 1st and 2nd editions of Stephanus have “Bethany beyond Jordan.”
John 16:33 - Beza and Elzevir read “shall have tribulation,” while Erasmus and Stephanus read “have tribulation.”
Romans 8:11- Beza and Elzevir read “by His Spirit that dwelleth in you,” while Erasmus and Stephanus read “because of His Spirit that dwelleth in you.”
Romans 12:11 - Beza, Elzevir, and the first edition of Erasmus read “serving the Lord,” while Stephanus and the 2nd to the 5th editions of Erasmus read “serving the time.”
1 Tim. 1:4 - Erasmus, Beza, and Elzevir have “godly edifying,” while Stephanus has “dispensation of God.”
Heb. 9:1- Stephanus reads “first tabernacle,” while Erasmus and Beza omit “tabernacle.”
And many more examples could be added to that.
The Majority Text has 3000 plus manuscripts to go by.
As I pointed out in post 78, the majority text is a statistical construct that
does not correspond exactly to any known manuscript. It is arrived at by comparing all known manuscripts with one another and deriving from them the readings that are more numerous than any other. The majority ext is not the same as the textus receptus.
They are not identical.
The two differ from each other ca. 1900 places.
Stephanus and Beza also are two more witnesses. The detractors of the modern translations primarily have only two manuscripts; the Vaticanus and Sinaiticis (I don't count the Alexandrian because it is worse than the prior two).
As the above examples show Erasmus, Stephanus, and Beza etc. all have difference betweens them. No two are identical.