Find files that have a confirmed duplicate in same directory recursively

Say I have the following directory structure:

root
 |-- dirA
     |-- file.jpg
     |-- file-001.jpg <-- dup
     |-- file2.jpg
     |-- file3.jpg
 |-- dirB
     |-- fileA.jpg
     |-- fileA_ios.jpg <-- dup
     |-- fileB.jpg
     |-- fileC.jpg
 |-- dirC
     |-- fileX.jpg
     |-- fileX_ios.jpg <-- dup
     |-- fileX-001.jpg <-- dup
     |-- fileY.jpg
     |-- fileZ.jpg

So given a root folder, how can I find dups that have identical names (differing only by a suffix) recursively?

The name can be any string, and not necessarily file.... The suffixes can be 001, 002, 003 and so on. But it is safe to assume that there will be a 3-digit numeric pattern and _ios literally (for regex matching).

My linux foo is not very good.