I think what 8 ball was saying (I hope I have this right) is that if you know the flow rate through your system and measure the pressure drop for each component at this flow rate then you can simply add them all up.
I would have thought (but I could be completely wrong) that the pressure drop through the whole system will be the pressure difference that the pump can create at that flow rate which you could read off the p/q charts.
If one water block has twice the pressure drop as another water block at a particular flow rate which is the same flow rate acheived in a system, then one water block will still have twice the pressure drop when installed in that system.
Not sure what you meant about the parallel flow bit
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