I don't see it for Zara because she doesn't seem to have her own style, her pre Lush Life music is super boring, Lush Life was one time thing where she got lucky, Never Forget You despite being good sounds like a MNEK song where he just featured her. Her next single should determine her fad status but as for now I doubt she'll ever score a hit again.
On the other hand Dua songs sound like they come from the same artist/album and are good