Of course it is the same one and only mystery.
What nonsense to disregard all the scriptures given and make two different gospels, two different mysteries, and two different people unto the Lord.
Ephesians 3
The Mystery of the Gospel
1For this cause I Paul, the prisoner of Jesus Christ for you Gentiles,
2If ye have heard of the dispensation of the grace of God which is given me to you-ward:
3How that by revelation he made known unto me the mystery; (as I wrote afore in few words,
4Whereby, when ye read, ye may understand my knowledge in the mystery of Christ)
5Which in other ages was not made known unto the sons of men, as it is now revealed unto his holy apostles and prophets by the Spirit; 6That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel: 7Whereof I was made a minister, according to the gift of the grace of God given unto me by the effectual working of his power.
8Unto me, who am less than the least of all saints, is this grace given, that I should preach among the Gentiles the unsearchable riches of Christ;
9And to make all
men see what
is the fellowship of the mystery, which from the beginning of the world hath been hid in God, who created all things by Jesus Christ:
10To the intent that now unto the principalities and powers in heavenly
places might be known by the church the manifold wisdom of God,
11According to the eternal purpose which he purposed in Christ Jesus our Lord:
12In whom we have boldness and access with confidence by the faith of him.
13Wherefore I desire that ye faint not at my tribulations for you, which is your glory.
SAME ONE AND ONLY MYSTERY. Paul says that it is revealed to the APOSTLES and PROPHETS.
And that it was that the GENTILES WOULD BE INCLUDED---just like the other scriptures I gave you!