Hello, JeffSissons.
Welcome to Microsoft Community!
I understand that you are about to purchase the new Surface Pro 11 and would like to use your current Surface Pro keyboard with it.
I will show you the following information about the Surface keyboard:
Learn more about Surface Keyboards and Type Covers - Microsoft Support
It's easy to see that the keyboard model that is compatible with the Surface Pro 11 is none other than the Surface Pro Keyboard:
And a version of the Surface Pro Keyboard with a Surface Pen charging slot:
So if you have the Surface Pro Keyboard, you won't need to buy an additional keyboard to go with your Surface Pro 11!
If you think the information I've shared with you could help you, you can mark my reply as an answer by clicking “Yes” or “No” at the bottom of the reply.
This will allow more users in the community to learn about Surface Pro Keyboard compatibility information for your convenience.
Thank you for your understanding and support of Surface products and the Microsoft community.
Good day.
Best Regards.
Leo.L - Microsoft Community Support Specialist