I think you should research the twin EGR set up a little more thoroughly not the same as the earlier single EGR.I have no idea. But one is guaranteed to cost you money the other is only likely to cost you money?
Just checked. New EGR valve and gasket etc £84?
Fits Fiat Ducato Peugeot Boxer Citroen Relay EGR Valve Pipe 2.3JTD-HDI 11-On
New EGR Valve Pipe And Gasket Fits Fiat Ducato, Peugeot Boxer And Citroen Relay 2.3JTD-HDI (2011-Onwards) Please See Drawing For Location Of These Two Parts.coastalmotorhomes.co.uk
I have looked for a reliable price to repair common adblue faults and they all seem to be in excess of £1,000 and sometime way higher.
Plus the cost of buying adblue as well.