Chainsaw Repair

It hasnt made it to me yet. Hopefully it will make it here in time for the Blizzard.  The previous owner send me photos of it including some of the cylinder. First thing I will do is measure it. It sure looks like the CP version. I am hoping that maybe I can clean up the cylinder and use the 535 piston. I was just hoping to get the actual dimensions of the CP 55 piston to compare against the 535 piston. THey sure look the same but I havent seen anyone confirm that the the critical dimensions like the overall height and dimension from the pin to top is the same as the 535. Maybe I missed it. It is putting me at a disadvantage having the previous owner already toss the piston. What does this cylinder look like to you all?