Rod on top in foto is 360, rod on bottom is 340. The balancing pad on the large end of the 340 rod has been ground down quite a bit and the pad on the 360 rod looks to be virgin (untouched).
Pad on bottom rod definitely is smaller relative to the upper rod, though it still might be all out of the factory condition. Does the pad of the bottom rod look like it was dressed on a grinder/belt sander, or does it have machine tooling marks?
Looks like bearing shells are still in the big ends of the rods, pull one apart and check date code on the back side of the shell, that will let you know when it was touched last.