I would not run packs that
-aren't the same manufacturer
-aren't the same rated capacity
-aren't the same C or discharge rating,
-aren't new together(ie no old pack new pack combos)
See cells have internal resistance that changes depending on all of the above, even the same pack charged vs not charged will have different IRs. Mismatched paralleled cells with different IRs will cause strain on the lowest IR pack, as the higher IR pack will resist giving its magical juices. This will in the long run kill good cells.
Always match packs, always match packs by health/age. Good luck