Both involve "accidental" pregnancy (for all except the female lead in One Night Stud). If you liked One Night Stud then you should like Fated to Love You. The main difference between these two is that Fated to Love You is more melodramatic and drawn out.

They both have similar plots; the main woman has a one night stand and ends up pregnant. If you enjoyed One Night Stud because of the plot and mature humor then you will like One Night Surprise.