Percho, what is the purpose of your post?
from the foundation of the world refers to a different period than before the foundation of the world. Anyone who says otherwise is simply redefining apo to mean pro.
Paul says God promised eternal life before (pro) times eternal. When would that be? Most commentaries say before the foundation of the world, or a promise made before creation. That could refer to when the Father appointed the Son to be the Lamb of God.
The reason I do not state this view as a certainty, is that another possibility is that it refers to before times of the ages, which could refer to the Old Covenant promise. This seems less likely to me.
In summary, Titus 1:2 probably refers to the period before the foundation of the world, i.e. in eternity before creation, with the promise being given to the Son by the Father.
Using this view, then no, the two periods are separated, one before creation and the other after creation.
No particular purpose, I just wanted your thoughts on those two phrases.
I agree with you concerning Rev. 13:8 I believe it to be, from. I even think the concept of world in that passage is just as interesting as from the foundation thereof. Shoot even, "foundation," is an interesting word there.
Maybe more than the others.