We need to measure time difference of tasks moving from one Kanban's column to others based on values given by pick lists. Would there be a way to audit these changes in the same way as a normal lookup attribute?
Only if it is a Studio field can it be audited in Clarity. If you created a local pick list, that is not available for audit trail in Clarity.
This would be an enhancement idea you can submit: Enhancement Requests for Clarity.