Cpl vs ecm calibration number.

Greetings everyone.
Here is an interesting conundrum. I have 2 Cpl
Isl8.9 cummins engines. One is 3522 one is 3512.
Both seem to be exactly the same.
They are in bci busses. So probably calibrated by chinese workers.
If one has ecm calibration ck90008.10 in it.
And the other has x410.50 strange.
Cpl is different listed next to ck90008,

my question. Is the calibration number completely unique? Or slightly different per cpl. i can’t imagine
Having different settings within it.

Sorry again if this makes no sense at all.

 

Exactly my thinking.
There is no listing for any code against the correct esn or cpl.
Has me stumped.