Will the results be any different? If so, why?
Absolutely they'll be different. The normal plastic bad is not permeable to much of anything. I'm not sure of your experiment, but if you are using starch and Iodine, with dialysis tubing, the iodine can pass in and out, but starch cannot because the pores in the dialysis tubing are too small. With a platic bag, there are no pores, per se, and so neither the iodine nor the starch can move in and/or out.
