AMG V8 vs. regular MB V8 engines
 

Anyone know if there is a difference in the metals used to make the AMG V8 vs. regular MB V8 engines? I know there are differences in software, displacement (ie 5.5L vs. 4.7L), bore stroke, and AMGs are hand assembled. But are there actually any differences in the quality of metals used to make the AMG V8 vs. regular MB V8 engine parts like the pistons/rings, crankshaft, cams, chains, oil pump ect? From the outside the two V8s look very similar...see attached pics of both.
https://cimg1.ibsrv.net/gimg/www.mbw...86ba787370.jpg
https://cimg2.ibsrv.net/gimg/www.mbw...f1725ffd7a.jpg