To summarize :
I have taken 3 kits of DPM and measured them spring by spring.
Conclusion:
The length of the spring in the DPM cz TS kit has nothing to do with spring rate.
The springs in the DPM rated as follows: I've measured compression of 2 ", measured the spring L and used math to calculate the full spring compression
17.57# with spring length of 4.01"
17.4# with spring length of 4.44"
16.56# with spring length of 4.42"
16.78# with spring length of 4.1"
15# with spring length of 4.6"
14.3# with spring length of 4.56"
13# with spring length of 4.37"
The usual springs for CZ do not match ( too narrow) for DPM and can not be used.
In addition :
The Original "FROM THE BOX" CZ TS 40 spring is rated 15.8# with length of 4.92"