I would see if the pintles are 6mm vs. 5mm as your starting point.

There is a broad range of nozzles for the OM617.9XX application. You could use used German Boschs #240/, #261, #265, #1930, #315 and I am sure there are others.

#315's will flow about 15% more fuel, but you still have to deal with that extra fuel,, e.g., extra air, et cet.