Are all lossless tracks of a movie the same?

[nitinblurayfan]

I recently bought The Avengers in India and it sounds pretty bad. It was released by Sony, not Disney.
There is hardly any surround activity and the sound (especially the high end) doesn't have the same level of clarity that is in almost every lossless mix.
Truth be told, it actually sounds like like Dolby digital track. There is a night and day difference between Captain America (US import) and Avengers (bought in India).
I'm planning to buy it again from the US or UK.

My question is this - Do audio tracks differ across the world sometimes when released by different studios (like video quality does)? Or is it the same everywhere as lossless is lossless?
I don't want to waste my money buying another copy and getting the same quality as I wonder if it's placebo.

It is a 7.1 DTS-HD MA track with a bitrate of 5mbps.

Can somebody please help shed some light?

ALso, here is the Indian thread with more people complaining about the issue:
https://forum.blu-ray.com/showthread...=203839&page=2

Somebody please help me out.