Thanks for the info, Luther Sloan. I see where you're coming from, but I'm afraid I don't agree with your conclusions
Since it's been asked for by Warped9, Vonstadt and others, here's some trivial "proof" that Spock Prime is the
Spock from TOS:
His working with the Romulans (seemingly in the open now) is a continuation of his work in TNG "Unification", and the improved Federation/Romulan relations at the end of "Nemesis".
He repeated the line "I have been and always shall be your friend" from Wrath of Khan.
"Something I learned from an old friend" is reference to the repeated time-travels during TOS and the TOS movies.
His knowledge of Transwarp Beaming suggests he knew the ressurected Scotty from TNG "Relics". It's likely Scotty finally perfected his Transwarp beaming formula after his return owing to the obvious fact it was never used during TOS or TNG.
Of course you'll all say "similar things happend to an alternate Old Spock". Same goes for every episode of Star Trek ever made