I know they are different in a lot of ways but there is a few similarities. Like Arnav and Asad characters are similar in that they are both kadoos and fighting their love whereas Zoya and Khushi are both happy go lucky with a painful past but they move past that and embrace life whereas Asad and Arnav let their past affect their future.
Anyway, there are a few more similarities like Nk coming into the picture which caused Arnav to be jealous and in QH there is another person coming in and maybe that will cause jealousy for Zoya.
So, i agree, not the same but a few similar storylines, like the time when Arnav and Khushi went to that dhaba and spent the night which started with Arnav upset with khushi and then it ended with him looking after her and somewhat similar to mangalpur with zoya and asad where asad was mad at zoya and then it ended with him saving her and taking care of her.