Yes powdered egg white is just as healthy as regular egg white.
Powdered egg white is just egg white that is turned into a powdered form but they started out as real eggs.
The only difference between the real egg and powdered egg white is that it went through a process to turn the real egg white into powdered form.
But they are actually real eggs even when they are egg white in powdered form and even regular powdered eggs are real eggs.
The only difference is that they are in powdered form.
So you can eat powdered eggs and powdered egg whites and still get the same health benefits.