I will try to help with this. Both pumps will put out similar pressures, as its the regulator that limits the actual fuel pressure. The early pump has a 10mm Banjo and the later pump has a 12mm Banjo. Your lowest cost is to stay with the original pump as long as its working.
When you change up to the 12mm pump you will need a new Banjo & copper crush washers & cap nut. They are not expensive, but then you must fit this Banjo to the old hose that is likely ready for replacement. So you then need to fit a new front hose over to the tunnel. Again, not expensive, but the issue will be with the connections to the tunnel tube.
The original hose is permanently crimped to the Polyamid tunnel tube. Buying a new tunnel tube adds to the cost and its a major pain to replace. Not technically difficult, just time consuming and a pain in the butt to do, so this is not an option unless absolutely necessary.
If you must go with the new pump, I would be happy to help with new hose & fittings. You will have a hose clamp at the tunnel, but it should be OK with periodic inspection.
Happy to answer any questions, but please email me as my PM box is almost always full and I cannot send photos via PM.
Have a great Porsche day.
Len at Autosportengineering dot com