Below you can see the front-view size comparison of the Pentax WG-3 and Kodak Astro AZ651. The Kodak Astro AZ651 is clearly the smaller of the two cameras. Its body is 124 mm narrower, 64 mm shorter and 33 mm thinner than the Pentax WG-3.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.