If the packs are very well matched, then you'll be fine. After you can charge all the cells in one pack at a time.
But I'd be very cautious - it likely that the packs are no longer that closely matched, even if they were the same when new. If they're a long way out you might run into trouble. If you have a fancy enough charger that you can identify the voltage(s) at which the cells peak, then you could compare the peak voltages of the packs. If they're peaking at near the same voltage and taking the same capacity you might get away with it.
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