It depends?

Are you trying for precision shooting over long distance? If so, yes.

If you are shooting out of a 16 inch barrel AR at targets 200 yards or less, then there are so many other things that will impact your accuracy beyond the difference between the cases that the cases become all but irrelevant.

Accuracy in shooting is dependent upon the capabilities of the gun as well as the capabilities of the shooter. Of the two, YOU are - by far - the variable least likely to be able to achieve consistency.

I suggest that until you can achieve 1) a consistent hold, 2) cheek weld, 3) sight picture, 4) trigger pull, and 5) follow-through on each of your shots, don't look to the rifle as a source of variability.