Protein powder for baking is often processed from egg white, and can also be called egg white powder. This is a baking ingredient that needs to be added to recipes when making desserts such as macarons to help control moisture during processing and to bring out some of the processing performance characteristics of egg whites.

Other protein powders, such as health products, may be processed from soybeans, because soybeans are a complete protein food, containing 8 essential amino acids for the human body, and are basically similar to the protein composition of meat.

So, these two things are very different in terms of raw materials and uses.