Zoho Desk Multibranding situation

Zoho Desk Multibranding situation

Hello,   We have a situation for which I'd like to know if the setup might present issues.    Here is what is happening:

We developed a white labeled version of our software for a partner.   As a part of the deal, we were to also add a help center for them to support the product.    I used the multi-branding feature in Zoho Desk to create a separate Help Center (unique users for each) using a second department.    Our organization uses CRM Plus.    Their organization uses various Zoho applications (subscriptions, CRM, etc).

Will "sharing" one of our apps with them cause any issues given the fact that we both have our own separate Zoho organizations?

would we need to buy CRM Plus licenses for their agents or just Zoho Desk Licenses?