Is there any way or workaround to transfer solely the keynote parameter for same named elements from one project file to another?

Assigning keynotes can be tedious. We have a project with 15 buildings which are all separate files. When we assigned keynotes in one file for elements, can I transfer only this parameter to families of the same name in another file?

I need to transfer only this parameter because we have individual settings for walls etc for different files, but they are of the same name.

Please help. Thank you!

I am working in Revit 2016.