AllSync & AllDup

Today, searching a single folder (using "Compare only files within the same source folder," on the Source Folders tab, and I *know* that I have 2 jpg files (one's extension is upper case, the other is lower - does that matter?) that are the same date and size. My search method is "Find Duplicate ...

I'm attaching a side-by-side of 2 folder structures that I'm comparing.

Folder on the left contains "All Contacts.vcf"
Folder on the right contains "All Contacts (2).vcf"

I have tried all manner of the "Find similar file names" options and none of them return these as duplicates.

The 2 files have ...