Actually yes they are quite different, i don't recall the Democrats pandering to anti-vaccine fearmongers or 9/11 "truthers", praising Putin's seizure of Crimea or Assad and
claiming that the downing of MH17 was a Zionist false flag op.
Well maybe Tulsi Gabbard but she stands alone.
There are plenty of Democrats who would do all of that if they had to run against the Party with no intention of returning.
But yes, "Take the most left-wing House member, then give them paranoid schizophrenia" is the average Green Party member.