I am putting new 1/4 bearings in a cup and cone rear hub, I will also need to do a loose bearing bottom bracket.

I usually buy a new tub or two of quantity 25 Grade 25 loose bearings from Wheels Manufacturing when I do these jobs, but I have some partial tubs left over from previous jobs, enough to do at least the hub without getting another new one.

I obviously don't know when these different batches were manufactured, don't even know if all the bearings in one tub come from the same factory run, but being Grade 25 (within 25 millionths of an inch), shouldn't I be able to use these leftovers together?

I am going to get a bottle of 150, just a few bucks more than another tub, but I want to use up the ones I have first.

The question is, can partial quantities of Grade 25 bearings be combined?