Rod bolts fell out!

So it is always advisable to resize the large ends when the bolts are replaced. This is due primarily to a possible mis-match on the caps to the rods, which (I think) can lead to spun bearings. That said, there have been those who have replaced rods and didnt resize and got away with it. Usually this is on engines with loose clearances on the rod journals.

The risk is yours to take.