And that is known how? The two opposing standards, the more common readings of the text, aka the Majority Text , and the notion that older is always better aka typical for the Critical Text.
It is for certain known when they agree. Lets say the Majority/Byzantine text agree with the oldest manuscripts. The Original Text. There is no doubt then. When they disagree then the Majority seem to hold the Original Text. See how it is not bad manuscripts but bad choices by certain editors (textual critics).
It seems to me to be beyond doubt that ageement between the TR, MT, CT is the original text.
Next the TR, MT verses CT. The TR, MT is the original text.
Then the MT, CT verses the TR. The MT, CT follow the original text.
Now what about the TR, CT verses the MT?