Viva Insights - How can I replace the Organization field data without any data loss?

Viva Insights - org upload transition from Viva Insights to admin.microsoft.com

Since the last time I performed a manual organizational data upload, the organizational data upload process has moved from Viva insights to admin.microsoft.com.

• At this moment in time the manual CSV import is my selected choice.
• I am hoping to find an explanation of the field mappings from the old CSV upload template (DataUpload_template.csv) compared to the new CSV upload template (OrgDataTemplate - with skills.xlsx) -- Microsoft's help articles do not appear to include these details -- it does not appear I'm able to attach the templates here

My goal is to perform a new manual upload and replace the organization field with a new set of data for all employees without losing any other existing data. 

• I must understand how the new upload template maps to the data fields that I've been uploading
• I'll then need to understand what steps I must take to replace the organization field without losing any data