There is a very big difference between the ancient Mass and the new Mass and it is not the language,Latin, it is not primarily the language..but what you truly have is a difference in theology and even doctrine...our Catholic faith has been compromised because of changes in the liturgy of the Mass...
There is a great difference which exists in the theology of the priesthood which you have in the ancient Mass and in the new Mass.- Fr.Michael Rodriguez
In this video Fr.Michael Rodriguez does not say that the compromised 'new faith' comes to us with the irrational premise used to interpret Vatican Council II and the dogma extra ecclesiam nulla salus.If we avoid the premise, we are back to the old faith.The ecclesiology changes and the ecclesiology depends on the use or omission of that simple premise.It is the premise which creates a new theology and new doctrines and conclusions.
Similarly in the following video Michael Voris asks what is the cause of this change. They know there is a change but they do not know the precise cause of the change.
Similarly on yesterday's CMTV Download on faith, the cause of this difference in faith, in the Catholic Church was not mentioned.