IMO you have just found the correct recordings, just another edition and so the titles are printed in another language than the one you are looking for (which is not necessarily the works original language either, BTW).
For instance, here is a compilation of European music that I have:
Now look up on top of the page and click the “see all versions of this release, 4 available” link then you will find other editions that may feature various other languages.
But mine is BEST CLASSIC 100. Maybe for your BEST OPERA 100, there is no other edition in MB yet, or maybe their recordings are not merged and only the Japanese release had some fingerprints submitted.
Actually @ListMyCDs.com found your release, so maybe we have some recording merges to do between that BEST OPERA 100 that @ListMyCDs.com has found and the recordings you found.