t-sql get the primary key's column name when using Change Tracking - Changetable

Question

I am trying to get the changes from Change tracking dynamically.

select [tableName].*, CT.SYS_CHANGE_VERSION, SYS_CHANGE_OPERATION
from [tableName]
right outer join
    CHANGETABLE(CHANGES [tableName], [start version]) as CT on [tableName].[Table's Primary Key] = CT.[Table's Primary Key]
where CT.SYS_CHANGE_VERSION <= CHANGE_TRACKING_CURRENT_VERSION()

Is there a way to get the primary key's column name from the Change tracking / ChangeTable?

In the documentation on ChangeTable there is reference to column_name for primary keys but I my guess is this is input and not output...

The column name is in there, if you execute:

select CT.* 
from CHANGETABLE(CHANGES [Table Name], [start version]) as CT 
where CT.SYS_CHANGE_VERSION <= CHANGE_TRACKING_CURRENT_VERSION()

Your thoughts would be much appreciated.