Did you know that the two words for rock are in Greek? They translate to the same word in Aramaic. Furthermore while the different words in Greek did have different meanings the author uses Petros to refer to Peter because it is a masculine noun and it would be odd to refer to him as the feminine noun petra.
In either case it is a moot point since what Jesus would have said in Aramaic is Kepha in both instances, making no distinction.
I didn't know the Aramaic part. Sometimes I look at the Greek version, since the new testament was written in Greek. Does the meaning change if its Aramaic?
I am not an expert in or even mildly knowledgeable of either language. I only know that this verse has been debated to death. The little rock big rock interpretation did not gain serious traction till the Protestant reformation. That Peter was prime was fairly widely accepted to that point. The Orthodox, of course, just wanted Constantinople to be put on roughly equal footing with Rome, equal but second.
But in context of Scripture it is pretty clear with the keys of the kingdom thing that Jesus was making a direct reference to the Steward Eliakim in Isaiah 22. Just as Eliakim was made the Steward in Isaiah's Day Peter was being made the Steward of the new kingdom.
