The Noriday pill has a different hormone in it (norethisterone) but it acts in the same way. You may find that you’re more sensitive to certain hormones than others though, so if you develop side effects with Cerelle that bother you, Noriday might be a better option for you, and vice versa.
If you’re three or more hours late in taking Noriday, it counts as a missed pill. So it can be a bit more demanding than Cerelle in this respect, where the window is 12 hours.