340 Rod questions

x4 Agree. ALL 340 used floating pins. I think the early 318 did too but cant remember the cutoff date.
As far as reconditioning I would visually inspect the bearings. If you see any odd wear you might take them and have them checked at a machine shop.
For a driver or moderate HP street car its not that critical. I cant tell you how many times I just did a re-ring / bearing job and never had any problems.
Dont sweat the rod with a different part number. Its not uncommon for engines to leave the factory with mismatched rods. If you ever pull an engine down and see some copper rods, they are factory reconditioned. Specs were off so they copper plated them and remachined.