They sound like no one else
Seriously? People line up to comment on the resemblance to Khachaturian and you claim he sounds like no-one else?
And when it comes to Shostakovich, we're talking here about the ballet music. Not the most inherently distinctive part of that composer's output either. In fact, given the trajectory of his career, I'd go so far as to say there are works
by Shostakovich that don't especially sound like "Shostakovich".
The whole idea that composers have such "distinctive fingerprints" that they can't possibly be confused with anyone else is belied by the whole uncertain history of musicology. At the very least they risk being confused in the early parts of their career with their teachers and those they imitated, and later on they might be the teacher or person imitated.
When I tell you that there are several Galops by Khachaturian and Shostakovich that sound quite similar to the sound file, that's because I just did direct comparisons between this recording and recordings of Galops by Khachaturian and Shostakovich. I didn't make any declaration that it was actually a work by Khachaturian or Shostakovich. In fact, given that other people had
already referred to those composers, the more significant point was that the piece might be a Galop.