RB911G vs RB922UAGS

I’m taking a look here at the RouterBoard site and noticed that rb911g shares the same pcb and most rb922 components including wireless chip, this in turn caught my attention because the 911 has a heat sink and 922 not … Does not influence anything?

I’m pretty sure it has.
https://img.routerboard.com/mimg/984_m.png

http://forum.mikrotik.com/download/file.php?mode=view&id=25818
rbs.jpg

Real pictures:
rb922uags-5hpacd.jpg
CWD7g_mWIAACj7B.jpg