Stagger jetting question

More Voodoo than science.
The original Carter 625/750 AVS carbs used on 383/440 engines. The holes in the secondary discharge tubes are hard to see because they are drilled from the rear of the tubes before the tubes are pressed in. If you remove the tubes from a 625 & 750, the hole placement & size is slightly different between L & R & between each carb size. I assume this was to try & get the A/F ratio as close as possible for each runner.
TQs are the same. Hole sizes, locations different.