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If you know how to measure spindles and can do math it's not hard to get a good approximation of a current BB replacement size. One key is to find the old spindle's center between it's bearing surfaces and only measure from that to the drive side spindle end. The new spindle length is twice this. But there's some fudge depending on a few factors so the best replacement size will be determined by actual trial.
Changing the number of loose balls won't change the pitted condition of the spindle or cups, won't change the spindle size needs of the ability to get a best adjustment. Andy.