My nostrils are at two different heights. Can an alar rim graft solve this issue? (Photo)

No, an alar rim graft will add support to the alar rim but will not change the position of the insertion of the alar base on the one side.

Although it is difficult to evaluate your nose with this one picture it does appear that your tip asymmetry is not only secondary to nostril height but also a difference in the contour of the lower lateral cartilages. I don't think an alar rim graft will solve your problem but discuss this issue with your surgeon.