Both the recipes are basically paneer simmered in greens sauce o gravy. In this easy palak paneer recipe we use only spinach whereas in saag paneer a variety of mixed greens are used. For making saag paneer you can use mustard greens, palak and methi leaves. The recipe procedure is the same. Methi leaves are fenugreek leaves and have a slight bitter taste. Use tender fenugreek leaves for mild flavor. You can also just make methi paneer.