You’re right. I got way too far with claiming equivalence.
As for non-identity problem—I have trouble answering it. I don’t want to defend my idea, but I can think of an example when one brings up non-identity and comes to wrong conclusion: Drinking alcohol while pregnant can cause a fetus to develop a brain damage. But such grave brain damage means this baby is not the same one, that would be created, if his mother didn’t drink. So it is questionable that the baby would benefit from its mother abstinence.
You’re right. I got way too far with claiming equivalence.
As for non-identity problem—I have trouble answering it. I don’t want to defend my idea, but I can think of an example when one brings up non-identity and comes to wrong conclusion: Drinking alcohol while pregnant can cause a fetus to develop a brain damage. But such grave brain damage means this baby is not the same one, that would be created, if his mother didn’t drink. So it is questionable that the baby would benefit from its mother abstinence.