Old Mamba 25 vs. New Mamba 25/Sidewinder Micro

I was looking at the Mamba 25 that came in my Trinity NOW, and I just realized that it's different than the Mamba 25 I ordered a while ago to use in my Micro-T (ESC is no longer in that little truck).

It looks like the new Mamba 25 doesn't have any surface mounted FETs like the old Mamba? I'm confused here really. Is the new design supposed to be better than the old design? Can someone please explain what's up here?