do you think pis also falsifies them
I think they would if they felt they needed to (Kaczyński clearly has no special respect for democracy) but I don't think anything major has happened. There's enough scrutiny (though again PiS doesn't like that either).
In talking about closes cases, Lukashenka could have claimed just a few points over the next candidate (say 45%) and people probably would have accepted it (since his support probably was around 40-ish per cent - but his ego got the best of him so he went for the 80% which no one believes.