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Stacking scanned original with derivative file?

Sep 28, 2008
Tacoma, WA
Lightroom Experience
Lightroom Version
Lightroom Version
Operating System
macOS 10.15 Catalina
My brother sent me a bunch of scans he made of old family photos, and he also processed many of them in LR and exported the processed files as jpg files. So I have a bunch of tiff/jpeg pairs with the same filename (except of extension), and I'd like to have each of these pairs stacked together.

If these images were taken with a digital camera, then auto stacking by capture time would work. Unfortunately, since all the capture times were set to exactly the same time, auto stacking by capture time isn't going to work.

Is there any way to automate this process, or do I have to go through each pair one by one and stack them manually?