they need to be re sized or atleast checked because changing the bolts can change the clamping load distorting the big end of the rod....you gotta remeber this stuff is invisible to the eye, but can make a big difference in how the bearing wears.....
as for the bolts themselves, it depends on the bolt as mentioned above weather their pressed in or not but all that would be handled by taking the rods and bolts in and having them re sized