TDI Fuel Injector Pressure: Questions & Answers

Hi,

I have a question about the injector pressure for the VP TDI engine.

There are different pre-injection pressures for the nozzle holders/rods.
Euro2 = 190 bar.
Euro3 = 220 bar

My question is now, do the nozzle holders differ between different vehicles?
at the main injection pressure, or can the nozzle holders be cleaned with, for example, 220 bar?
Exchange opening pressure values randomly.

The background is that...
I have a set of fuel injectors, part number 028 130 202P, from an ALH engine lying around, and I'm toying with the idea of using them.
Considering equipping my ASV (presumably a type of vehicle or device) with different nozzles (205 or 216).