One has a real stick turning into a real snake while the other one just makes it appear as if by illusion. When Moses' stick devoured their lies, people had to make the distinction.
It was followed up by 8 other signs, each bigger, the next one was his hand emitting bright light that harmed not the eyes of people (ie. was without evil).
It was followed up by 8 other signs, each bigger, the next one was his hand emitting bright light that harmed not the eyes of people (ie. was without evil).