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I'm not an expert on classical music, but I have tried playing this piece and, yeah, it was an epic fail. 

Rachmaninoff is known for making big jumps in the hand. It isn't _that_ prevalent in this piece, but there are some spaces bigger than an octave, which is generally what most pianists can stretch their hand too. 

In the piece you listed: 

- It's played mostly on guitar, but on piano it doesn't involve much stretching of the hand. 

- It's a pattern that's repeated; in the 3rd concerto there is a very discreet pattern as the alberti notes quickly change. 

- The concerto involves fast contrary movement in both hands, something Asturias doesn't. 

Both pieces are hard, but the concerto is harder.