As far as I am aware the blocks are the same.
I'd be very wary of raising the rev limit of a 93T, as a long stroke engine - they just don't like revs. With my TD06Sl2 20G, and 212-B billets I have it set at 7500rpm. If you dial the cams in right you will get the 'sweet spot' where you want it (within reason).
No I don't think you'll need to send the 93T ARPs back. I'm not even running them, just 12mm Evo stockers.
