RE: FOC and trajectory
If the arrows weighed the same and had the same fletching you probably woudn't see a difference. A difference in total arrow weight will give you a different trajectory though.
I have a 533 grain arrow that is 12.63 inches high (above line of sight/aim) at 22 yards on a 40 yard shot and I have another 605 grain arrow that is 14 inches high at 22 yards on a 40 yard shot. They do have a different FOCbut the total arrow weight gives me the different trajectorys.
It is also possible that a four feather fletch with a severe helical and offset would give you a different trajectory than one with 3 blazers at a slight offset but that would be because the arrow speed is affected, more drag with the feather configuration, so the feathered arrow would have a higher trajectory.