Nikon B600 has a
16.0MP 1/2.3 (6.17 x 4.55 mm ) sized BSI-CMOS sensor . On the other hand, Casio EX-Z2000 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the B600 and EX-Z2000 sensor size comparison.
Nikon B600 and Casio EX-Z2000 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. On the other hand, since Casio EX-Z2000 has 14% larger pixel area (2.01µm2 vs 1.76µm2) compared to Nikon B600, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.