The nuclear membrane and nuclear envelope are two distinct structural components that make up the nucleus. There are a few significant differences between the nuclear membrane and nuclear envelope. 

Nuclear membrane

The nuclear membrane is a lipid bilayer that forms a selective barrier for the transport of materials between the nucleoplasm and cytoplasm. The outer surface of the nuclear membrane is continuous with the endoplasmic reticulum. 

Nuclear envelope

Nuclear envelope is a structure made up of two nuclear membranes with nuclear pores. It completely envelopes the nucleus, separating the content of the nucleus from the cytoplasm.