Pallaeon did come into his own after Thrawn was killed, and even noted that he carried some of Thrawn with him. It is not out of the question for Pallaeon to go toe to toe with Thrawn, but that would mainly come from his experience in working with the Grand Admiral.
Pelleon could maybe take on Thrawn successfully, and that's because Pelleon was Thrawn's protege.
Garm Bel Iblis was the only guy that I recall that actually could go toe to toe against Thrawn, but then the Corellian was fairly unorthodox.
Garm on the other hand. He managed to go toe to toe with Thrawn, but IIRC Thrawn managed to gain the upper hand in their engagements. However, he did hold his own quite well.