Sony TX66 has a
18.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features BIONZ processor. On the other hand, Sony W330 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the TX66 and W330 sensor size comparison.
Sony TX66 and Sony W330 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 Sony W330 has 28% larger pixel area (2.01µm2 vs 1.56µm2) compared to Sony TX66, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.