Casio EX-FH25 has a 10.0MP 1/2.3" (6.17 x 4.55 mm ) sized BSI-CMOS sensor . On the other hand, Kodak Astro Zoom AZ651 has a 21.0MP 1/2.3" (6.17 x 4.55 mm ) sized CMOS sensor .
Kodak Astro Zoom AZ651's sensor provides 11MP more than Casio EX-FH25's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the EX-FH25 and Astro Zoom AZ651 sensor size comparison.
Casio EX-FH25 and Kodak Astro Zoom AZ651 have sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Casio EX-FH25 has 102% larger pixel area compared to Kodak Astro Zoom AZ651, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.