You can't expect the state to be the same (see [url="http://chessprogramming.wikispaces.com/Search+Instability"search instability). But you can expect playing at a fixed depth should produce similar playing strength with and without transposition tables, which is what I suggested you test.
sorry then, I misunderstood what you said.
Now I think i have no more problems and dubts with search, I just have to improve move ordering and try to apply more advanced search strategies.
Thank you for all