actually the source shows pitting edema for nephritic (when edema manifests) which is more gravity dependent whereas periorbital is not. Amboss states that periorbital is more common in nephrotic
https://next.amboss.com/us/article/Mg0MD2#Z2d34124476207c0a2151225ba364ad16
look under clinical features for nephrotic syndrome and it is the first thing listed