No. The Poke Body only applies to itself on the bench. Not another. In simple terms, the Poke Body does not apply to another active Old Amber. Yes, you may have one on your bench, but damage to an active Old Amber will still happen.
Weird, I read this a few hours ago and didn't quite understand the question. But now, at almost 11:30, I understand it.
Whenever a card has its own name in it, it is always self refering. Meaning: if you replace the name with "this card" it will still work. So for Old Amber, it would be read like this: "As long as this card is on your bench, prevent all damage done to this card by attacks." There are times when a card will refer to itself and other copies of the same card (I think.. :S) but that is not the case with Old Amber.