Hi there, @talbot004.
Thank you for choosing QuickBooks as your accounting tools. Yes, as long as you disconnect the older account that connected from QuickBooks. The new account will automatically download and categorizes your bank and credit card transactions for you.
You can check out this handy article for more detailed information about connecting bank account: Connect bank and credit card accounts to QuickBooks Online.
However, if you encounter error you may contact our Customer Support Team. As they have the tools to pull up your account in a secure environment and answering any questions you may have.
Before doing so, please check out our support hours to ensure that we address your concerns on time.
Please let me know how it goes by clicking the Reply button. I want to ensure that this has been taking care of. Have a great day!