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megane piston crown codes



  clio 182
Hi I was about to install my megane pistons into my clio block today for my turbo build before I noticed something.

I have 3 piston with bm5 on the tip and 1 cm5 I'm curious as to what this could be as I don't want it to ne different piston.

I've looked online and is its the reference number of the piston crown
But I'm confused why one is different unless the original owner had a cylinder down and replaced the piston.
Also I don't have piston numbered 1 to 4 so what have people done in this case?

Any advice would be great!
 


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