I am afraid you will have to test in order to know the answer to this one. Keep us posted.
I don't think so because the Asset ID should remain the same. As Greg said, you could test that with another stream and test leads.
You could also just not move leads who received Asset 01 to the new stream.
Hello Valerie -
We are going to be adding some champion/challenger whole email tests to our engagement program as well and I was curious what the outcome of your testing was. Did you have any members receive the email twice?