Nikon S630 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . On the other hand, Panasonic SZ1 has a
16.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor .
Below you can see the S630 and SZ1 sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon S630 and Panasonic SZ1 Cameras
Nikon S630 and Panasonic SZ1 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 Nikon S630 has 32% larger pixel area compared to Panasonic SZ1, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Nikon S630
or the
Panasonic SZ1 ,
including hyperfocal distance.