What are you talking about , what selfkey?
If you are thinking of some kind of digital key which is unique for any of us, then it would be very similar to the KYC. ID is unique information of each of us. Im this case there is not much difference anyways.
Hmm the difference would be how the whole process is now streamlined. Aside from it having a marketplace that lists many jurisdictions in one app, the KYC process is more efficient as you won't need to complete your KYC info over and over again when you'd want to process your bank/corporate application. 'Cause as I observed, most who were looking to sign up for any financial services will find most KYC procedures create fiction, resulting in a poor user experience.