I agree with Guy. I haven't seen anyone yet who can shoot the difference in a few pounds of spine, and I've been at this for more than 50 years.
If you want to match your arrows very closely, you need your own spine tester and grain scale, because what you order isn't necessarily what you get. I've had spines range more than 20# in a dozen that were supposed to be sorted to within 5# of spine. I've found even larger discrepancies in weight, up to 40-50 grains difference in shafts that were supposed to be weighed within plus or minus 10 grains. The only way to know what you're shooting is to weigh and spine it yourself.