Canon A3500 IS has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features DIGIC 4 processor. On the other hand, Nikon S3600 has a
20.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the A3500 IS and S3600 sensor size comparison.
Canon A3500 IS and Nikon S3600 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.