F30 320i VS F30 328i Engine Differences

So I was reading a very detailed post on the F30 driver forum while eating lunch today on the differences between then F30 320i and the F30 328i. (Engine Wise)

And it seems the 60hp difference comes down to different pistons and different software. Other than that they share the exact same parts.

I found this interesting.

The article is here:

http://www.f30driver.com/forum/showthread.php?t=966132