How to transfer and restore Whatsapp data between iPhones while changing the account type?

I have two iPhones currently. First one is a 6s logged in using my official iCloud acct uses Whatsapp, and second is a XS with my personal iCloud acct.

I wish to shift to using only one phone.

How do i copy data from my Whatsapp in 6s and restore it on XS seperately by using Whatsapp Business app, without causing harm to my existing personal whatsapp acct?

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