ASRS 2011304

The aircraft departing was an Aircraft Y, and overtook us on our left. He was doing a Coyote Hills Departure, and we were on a Hillsdale Departure. After a Foreflight alert of traffic, we saw him out our left wing way too close, and maybe 100 ft. above (in our blind spot). He was turning towards us during the exchange, (I took controls and dove down when we realized how close and his right turn intention). There's a back and forth on the radio of Tower chewing him out for overtaking on the left when he needs a right turn. I pretty much stayed silent except to say something like "Aircraft X just noticed someone off our left wing, but no longer have them in sight." The rest was between the Tower and the other guy. Tower then apologies to Aircraft Z, which I assume was meant for us. I think the Aircraft Y pilot was originally trying to find out from Tower what we were doing (Hillsdale Departure), and the Tower didn't answer him initially. A few minutes before my call, he asks something like "What should I do about the Aircraft A," and Tower doesn't reply. Later, Tower tells him to turn right (which was into me!!), and that's when I dove down concerned for a collision.