Casio EX-Z450 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, Fujifilm XP50 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor .
Below you can see the EX-Z450 and XP50 sensor size comparison.
Casio EX-Z450 and Fujifilm XP50 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-Z450 has 18% larger pixel area compared to Fujifilm XP50, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.