[david_draco]

Awesome! I will use this. I would like this even more if it stopped at filenames (ignored paths) and when equal, sorted by file sizes.

[mannschott]

This will already sort equal file names together. If I wanted to combine that with file sizes, I'd probably do some kind of

    decorate | sort | undecorate

dance on each line produced by find. Where decorate would add the start of each line the things you want to sort by and undecorate would remove them again.