The answer depends on the extent and nature of the damage to your ZZ plants’ leaves. If it is simply curling due to a short period of dryness (due to a lack of water), then it is likely to recover once water is provided.
However, if your ZZ plant leaves are curling and brown because they have been sunburned, they will likely continue to weaken and eventually die and drop off. In this case, we recommend removing the damaged curled leaves