Trying to encourage a holographic Shinzon to be a bit less attack-ey:
Look at me, Shinzon. ...Your heart, your hands, your eyes are the same as mine. The blood pumping within you, the raw material is the same. We have the same potential.
Now if Shinzon had said this, it would be plausible. He might not know that Picard has an artificial heart after a particularly vicious game of dom-jot. But Picard does know that, indeed Q went out of his way to remind Picard of it. So why does Picard say it? Is he hoping that if Shinzon assumes his place, someone will do a medical scan?