They may both be "anti-establishment mavericks" as Mair suggests, but in such very different ways that anyone with any real political background and knowledge, rather than blind bias, couldn't possibly confuse them in my opinion
They are different but while Corbyns economic policies are very much stereotypical left we really o not know where Trump stands on the left-right economic spectrum.
Lefties hate him because he is anti immigration, anti Muslim, somewhat nationalist, and I suspect they desperately want him to be economically on the right because of their 'blind bias' against him. The truth is we just do not know. He remains , for now, an unknown.