The premise is false. My zombie twin's relevant beliefs are not the same as mine, because of the constitutive role of experience in phenomenal belief. I now think the constitutive relation is central in answering the arguments. The ability to sense sense-contents is unacquired. An experience need not be accompanied by a phenomenal belief, and most experiences are not.
Phenomenal beliefs are more cognitively sophisticated than experiences.
Knowledge requires belief, so experience does not entail phenomenal knowledge. But a mere causal relation between experience and belief cannot justify the belief. An option has been missed. It is the role an experience plays in constituting a direct phenomenal belief that makes that belief incorrigible, and indeed incorrigible in virtue of its phenomenological structure, and so justified.