Hi I've just joined, ive been trying for the past few months to find someone that knows the physical differences between the ve pump for an idi and a di

I'm in the uk , I have an Isuzu trooper which had a 4jg2 (idi) but I rebuilt it as a 4jg1 (di) but now I need to match the pump to the new engine.

From what I can tell it down to the cam plate and plunger design. I know the injectors have a higher pop pressure.