Question regarding a few Region B Fox releases

[Funktion]

I usually buy my Blu-Ray discs from the UK, but there's a few Fox releases I want that were already released in several other European countries (Italy, Spain, France, Netherlands, ...), with no release date for the UK in sight, so I'm going to purchase them elsewhere. The thing is, as most of you are probably aware, Fox usually "downgrades" audio-wise their releases in some countries (replacing DTS-HD Master Audio tracks with lower resolution DTS-HD High Resolution tracks, supposedly to include a few extra dubs).

So I was wondering if anyone can help me out by letting me know, for the following films, which Blu-Ray Region B releases are not downgraded in any way (lower quality audio tracks, missing extras, ...) compared to the US equivalents of these releases:

-X-Files: Fight The Future
-Young Frankenstein
-Big Trouble in Little China (this one still wasn't released in the US, but the specs are known).