It won't have pressure difference at all...
What makes you think that?
I'm thinking there will be a lower pressure with the 1W, because with the oil squirters, the oil has 4 extra easy way outs in comparison to the normal PY oil circuit. This will lower the pressure the same way as when you have a puncture in your tyre, right? 
Can you please explain why there will be no difference at all?
Oil pumps are generally sized to provide adequate oil pressure in the worst case condition, which is usually a high oil temp, hot idle. As the mechanical pump is directly coupled to the crank, the relationship is fixed to engine speed. Once the pump size has been determined for worst case, it is then over sized for other speed points. This is regulated with a pressure relief/bypass on the pump, to ensure there is a smaller pumping loss and oil pressure isn't 10bar at 7,000rpm.
With that in mind, if you add 4 holes to the circuit, providing the pressure relief valve remains open (i.e. it is still bypassing excess oil back to the sump) then the pressure remains the same.
The quantity of oil the pump moves remains constant with or without oil jets/squirters.
However (and this was my question to Alexiskayak_7) this assumes the oil pump has additional capacity, and I'd like to know if this has been tested, or is a guess.
