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 JX550 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the EX-Z450 and JX550 sensor size comparison.
Casio EX-Z450 and Fujifilm JX550 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 23% larger pixel area compared to Fujifilm JX550, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.