Still probably http://rebrickable.com/build_set?s=MOC-6276&ov=1&setlist=0&partlist=0&s1=42056-1-s1&s2=&s3=&c=1&ignore_mold=1&ignore_alt=1 is more correct diff. For example additional part list in PDF includes http://rebrickable.com/parts/2850 which is present in original box 1.