Panasonic TS2 has a
14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor and features Venus Engine HD II processor. On the other hand, Panasonic FX78 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor and features Venus Engine FHD processor.
Below you can see the TS2 and FX78 sensor size comparison.
Panasonic TS2 and Panasonic FX78 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 Panasonic FX78 has 16% larger pixel area (2.31µm2 vs 1.98µm2) compared to Panasonic TS2, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.