What’s the difference between the sterling ray4 and the standard stingrays pickups?

Hard to find specifics on the websites. Is there anything special about the ray4’s pickups? I got a friend who found a body of one but it was missing it’s neck! Thinking of switching out then pickups for something like the ones that come stock in standard stingrays now, and putting a short sale neck on it. Haven’t posted in years!