Looking more closely - I haven't been able to reproduce this bug yet, but I think it occurs when the file names are longer than a certain length.
In each case one of the filenames is truncated by a couple of characters, while the other is complete.
Investigating this, I notice that if I have 2 books on disk with their filenames matching the titles in Calibre, but these titles are longer than a certain length, Calibre 1.5 will shorten the names if you merge the 2 books.
In certain circumstances it looks like it fails to delete the old file.
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