There is misunderstanding here, perhaps about what the OP asked. I’ve interpreted the question to be why there are two different ipv6 addresses. I suspect you’ve interpreted it to be why is there a ipv4 and ipv6 addresses. At least I hope so.
I gather that insulting internet randos is what you do for a living.
Cgnat is for ipv4, has nothing to do with ipv6. Suggest reading up on ipv6.
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There is misunderstanding here, perhaps about what the OP asked. I’ve interpreted the question to be why there are two different ipv6 addresses. I suspect you’ve interpreted it to be why is there a ipv4 and ipv6 addresses. At least I hope so.
I gather that insulting internet randos is what you do for a living.