You are absolutely right, that sidebar has been set using the Widget globally on the complete site from Appearance >> Widgets >> Single Product Page Sidebar.
So it’s not possible to apply that sidebar differently on different products.
If you want to apply different sidebars content on different products, then you can simply remove global sidebar content from Appearance >> Widgets >> Single Product Page Sidebar and then use the single product builder and set the content from there for that column as per your requirements.
Please watch this video I have captured for you: https://www.veed.io/view/06a9e8d2-a8cc-407d-a577-c97805d7841d?sharingWidget=true&panel=share
Regards 8Themes Team.
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