For the doubters, check out the pics of the Polish Tu-154 crash in the thread below, which hit upside down. Only the engines, wings and wheels are recognizable, the rest is bits and pieces of trash.
Statements like this provide little conclusive evidence of similarities or dissimalities between accidents.
To make comparisons you must track ground scars vs distance and spread of the debris field in similar open space or heavily treed area.
If significant ground fires were present then destruction from post crash fires might make it even more difficult to compare.
From a resulting debris standpoint after consideration of the impact vector, it's best to look at crushing damage to the hard areas of the aircraft like wing boxes and engines to make finer point assessments.
And of course I suspect that neither of these reference accidents hit upside down, but only ended up having parts tumble after the first impact with trees or ground.
The answer of differences, is in the details which are not resolvable from the photos that we have available to us.