You will if there's anything different about how the customers access the statements or what software they need to have to get there. If your system will require they have Internet Explorer 8 or later and the other system would allow access with IE 7 or higher and (for example) Firefox 30 or higher, you need new agreements. If the customer needs to have a PDF reader installed for your system, and the other bank only required that they view an image file, you need a new agreement.
That's just a couple examples.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8