Spark plug question

So the FSM calls for Champion N10Y for 273 4bl(commando), 273 2bl is Champion N14Y. Our engine has 2 bl pistons, but 4bl carb/intake, 340 solid cam.
Currently I have new Autolite 66, which cross over to Champion N14Y.
Is there much difference between the 2? Benefits to switching to N10Y?
Handy cross reference site
spark plug cross reference
Thanks
Steve