Using 2 different accounts concurrently on an iPad Pro

This is not possible.

Outside of Educational and Enterprise establishments, iPad and iPhone are principally intended to be a single-user device - and are not intended to shared in the same manner as you may be accustomed when using a Windows PC or Mac computer - which has multiple user profiles/accounts.

For managed environments, where multi-user usage is possible, the Deployment Guide provides appropriate guidance.

Shared iPad overview – Apple Support

For unmanaged environments, be aware that if you sign-out of iCloud and other Apple services - and allow another user to sign-in - you’ll not be able to change back for 90-days. So as to prevent account abuse, some critical Apple services will only allow one change of signed-in AppleID (on a device) in a 90-day period.

In conclusion, unless you fully understand and accept the implications, you would be well advised to reconsider any attempt to share your iPad with another user.

You cannot. This is not possible with the iPad's. They are designed to be single user devices and do not allow multiple accounts. One iPad, one account!