The piston travel would be the same, but there are some minor gains, due the better sealing of the piston rings. The longer rod also puts less side pressure on the piston, which also helps and maybe makes a little more HP, The higher up in the piston creates less piston rock= better sealing of the rings. I don't know what the gains would be but NASCAR typically runs 6.2 rods on a 358" Chevy motor, so there has too be good reasoning for that.
JMO
Zip.