the 115 bhp engine is the "baby" Pump Duse engine and came in around 2001
the pump duse meant more power whilst maintaining the same or better economy.
looking at parkers there is very little between the two, and they are both group 10, the 115 is 6 speed so you should have better in gear acceleration due to them being closer.
the PD engines generally remap better than the non PD although they are very fussy about what oil you put in them.
general problems can be found
here