Ricoh G900 has a 20.0MP 1/2.3 (6.17 x 4.55 mm ) sized BSI-CMOS sensor . On the other hand, Casio EX-ZS15 has a 14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Ricoh G900's sensor provides 6MP more than Casio EX-ZS15'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 G900 and EX-ZS15 sensor size comparison.
Ricoh G900 and Casio EX-ZS15 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.