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Both are 15" MacBook Pros.

I love doing things like this. It's fun to try to identify different Macs in the media and in print!
 
I know my Ives inside and out. Beige Macs are harder, but I remember saying to my mom as we were watching Seinfeld, "That's a DuoDock!" Sure enough, Jerry had one.
 
I think only the MBP's had the built in iSight and the IR sensor on the front of the machine - correct me if I'm wrong.

And the space around the trackpad doesn't look big enough to be the 17" - therefore, it must be a 15"... maybe 🙂

The size of the speaker grills is a better thing to look at.
 
The iSight and the location of the SuperDrive slot are dead giveaways. The 17" slot is nearly at the top of the bottom case. The 15" is closer to the middle.
 
You can also see the MagSafe in the picture. You can see that its rectangular, and not round like the older models. So, that tells you its a MBP.

Then, as others said, the speaker grill and Superdrive slot give the 15" away.
 
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