Jose,
I don't know for sure, but I strongly suspect it is the same sample, however, it sounds a bit better on the T1 and T2 because of the higher polyphony and some slight differences in the keyboard's sound engines. I've heard all three, and to my ears they sound pretty darned good, particularly in the hands of a highly skilled player. Unfortunately, I'm not in that category.
Cheers,
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)