Judas hanged himself. That is suicide. He is in Hell even not considering his actions in the Garden.. Pilate, well we do not know the state of his soul at the time of his death or whether he came to believe. We could say that he is probably in Hell but we cannot say that with certainty.
Judas was hung and he was split from throat to groin. That does not happen in a suicide. IMO, he repented when he took the silver coins and threw them, repenting of his deeds. It is not my place to say what his eternity will be like, it is not clear to me.