Interesting, did not know that. They probably learned the same lesson, but actually did something about it.
Actually, it was apparently driven by economics as the major factor. Converting everyone over to 5.45 would have cost the Russians more money than they had, considering that they had literal mountains of 7.62x39 sitting around in depots and their *entire* infantry logistics system was built around that round.
Their experiences in Afghanistan also lead them to that conclusion, but it seems that they'd made the decision prior to the end of their time there.