Canon SX730 HS has a 20.3MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features DIGIC 6 processor. On the other hand, Samsung WB350F has a 16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor .
Canon SX730 HS's sensor provides 4.3MP more than Samsung WB350F's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the SX730 HS and WB350F sensor size comparison.
Canon SX730 HS and Samsung WB350F have sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.