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The IRF9Z34 is still widely available in the USA. Why do you need to change? I assume two IRF9Z24 in parallel would not work for you or are also not available in Croatia?
John
The third modification is that MOSFETs are working in the clone instead of the original's bipolar transistors, so there is a need of minimal plus parts. You may find the Q3 FET switching the power supply towards the target circuit is unnecessarily over rated, however, this allows us to achieve the lowest possible voltage-drop on the power line.
That is a pretty big list.
John
The third modification is that MOSFETs are working in the clone instead of the original's bipolar transistors, so there is a need of minimal plus parts. You may find the Q3 FET switching the power supply towards the target circuit is unnecessarily over rated, however, this allows us to achieve the lowest possible voltage-drop on the power line.
From what you show and the choices, I like the IRF9530. It has lower gate capacitance (so your gate drive won't be affected) and probably adequate current capacity for that purpose, because the IRF9Z34 was admittedly way over spec'd. John