One is Norlevo, where a dose consists of one tablet that contains 0.75 mg of levonorgestrel. The other is Ovral, an old-style high-oestrogen contraceptive tablet, where two tablets are taken twice twelve hours apart. (EgenC, contains the same active ingredients as Ovral, just in different packaging.)
Ovral and E-Gen-C contains 50 micrograms of ethinyl estriadol and 0,25 –0,50 mg levonorgestrel.