let me tell you in simple way. Just compare this with you bank account, as you can open bank account in both your personal name and company name, same is with trading account.
Just because you are owner of business doesnt make these account interchangeable...
your business account will be different from your personal account like your savings and current accounts with bank.
So documents will also be more and less similar plus whatever extra required by your broker, which you will have to inquire from him...
Hope this was helpful