I wouldn't be so sure that HDTracks and others have different mastering. I did buy it from HDTracks, and like the other ones that were credited to Kevin Gray, it shows signs of being a DSD conversion. I would be very surprised if different masterings were released digitally to different stores on the same day, but the lack of clarity on all of this is shameful. It would be very interesting (but expensive) if someone could compare the two (and Pet Sounds) to be sure.
If someone bought Holland from Acoustic Sounds, lets see what common analysis software we have and compare reports. The Dynamic Range plugin in Foobar and MusicScope are at my disposal.