Hi @zegor_mjol,
Here are a couple of links which may help, with your specific query though, there are no differences between Hardware version 2 and 3 for the Balance 580. It is quite likely that one or 2 components inside may be different, but the technical specifications of both versions are exactly the same.
List of models, hardware versions and their release dates > Here <
Differences between the Balance 580 Hardware versions > Here <
I hope this helps,
Steve