+1 Don't sweat it.

I've even reused bearings from different BIKES when rebuilding a bottom bracket. My current utility bike, which will eventually have a sealed square BB, is running a bottom bracket cobbled together with leftover parts that were in decent shape. The cups and axle are from one bike, the balls are from another, and I removed the cages, so there are couple balls from yet another. They weren't pitted and the cleaned up perfectly, so I just threw them in. The BB has absolutely NO play and spins smoother than any sealed cheapo square taper BB. You would never know it.