1st 340 build

Not to highjack this thread, but I want to pull my running when parked cast crank 340 down and at least freshen the bearings before I put it in the Duster. I picked up an aftermarket steel flywheel for it and have the diagram for drilling it from the DC chassis book. How different, if any, is the counterweight balance of a steel 318 crank from a steel 340 crank, and would be worth the additional time and trouble to use the one I have from my '67 Coronet?