Variations in glass color are far more likely to be caused by changes in the amount of colorant, furnace temperature, weather (barometric pressure), degree of striking and a host of other factors. Keep in midn that amrble-making wasn't a precision business - despite collector's sometimes thiunking that it was. Batch and colorant were literally SHOVELED into the furnace. Keep in mind that Akro was shipping multiple train boxcar loads of marbles twice a week. Akro wasn't a short-run, small pot factory.
The digs at Akro show us the variations that come from starts and ends of batches and all manner of problems.
Small variations in colors are just that - variations.